5.9 Cummins Maintenance Guide: 12V, 24V and Common Rail (1994-2007) | Alligator Performance
The 5.9L Cummins earned its reputation the hard way: hundreds of thousands of miles pulling trailers, feeding cattle and hauling campers. The youngest of these trucks is now close to 20 years old, and the ones still running strong have owners who stayed ahead of a short list of known problems. This guide covers that list for every 5.9, what to buy, and what order to do it in.
The 5.9 used three completely different fuel systems in 14 years, so a part or service interval that is right for one truck can be wrong for another. Pick your year range to show only the maintenance and parts for your truck. Every product card lists the fitment exactly as it appears on the product page, and the product page has the final word.
Show maintenance for:
Quick answer: what to do first
1994-1998 12V
- Fix the killer dowel pin if there is no record of it being done.
- Change every fluid and filter so you have a known baseline.
- Test fuel supply pressure and replace a tired lift pump.
- Refresh the cooling system: thermostat, bypass and heater lines, hoses.
- Go through the front end before it turns into death wobble.
- Service the transmission and adjust the bands before towing season.
1998.5-2002 24V
- Put a fuel pressure gauge on it. Low supply pressure is the number one killer of the VP44 injection pump.
- Replace or upgrade the lift pump if pressure ever drops below 5 psi, or if the pump is original.
- Check for a 53 block and inspect it for cracks or coolant seepage.
- Change every fluid and filter, including the correct fuel filter for your year.
- Service the 47RE and adjust the bands, or check the manual transmission fluid type.
- Go through the front end: track bar, ball joints, tie rods and the steering box mount.
2003-2004 and 2004.5-2007
- Check fuel supply. Know whether your lift pump is on the block or in the tank, and make sure it is keeping up.
- Change every fluid and filter, including the 7 micron fuel filter. Clean fuel protects the injectors.
- Watch injector health: hard starts, rough idle and heavy blow-by are warning signs. A return flow test confirms it.
- Service the transmission and add cooling if you tow.
- Go through the front end: track bar, ball joints, tie rod ends, drag link and the steering box.
- Check for exhaust manifold leaks and intercooler boot leaks. Both cost power and raise exhaust temperature.
Which 5.9L Cummins do you have?
Alligator splits the 5.9 into the same four year ranges the parts catalogs do, because that is where the parts change. The 1998 model year is split between two different engines, so check yours before you order.
| 1994-1998 12V | 1998.5-2002 24V | 2003-2004 | 2004.5-2007 | |
|---|---|---|---|---|
| Injection pump | Bosch P7100 inline, mechanical | Bosch VP44 rotary, electronic | Bosch CP3, common rail | Bosch CP3, common rail |
| Factory lift pump | Mechanical, cam driven, on the block | Electric, on the block | Electric, on the block (many were later moved into the tank) | Electric, in the tank from 2005 |
| Automatic | 47RH (1994-1995), 47RE (1996-1998) | 47RE | 48RE (47RE behind the 2003 standard output engine) | 48RE |
| Manual | NV4500 5-speed | NV4500 5-speed or NV5600 6-speed (NV5600 from 1999, and the only manual behind the 2001-2002 High Output) | NV5600 6-speed (NV4500 behind the 2003 standard output engine) | NV5600, then G56 6-speed from mid 2005 |
| Front axle (4x4) | Dana 60 | Dana 60 | AAM 9.25 with coil springs | AAM 9.25 with coil springs |
| Known weak points | Killer dowel pin, aging lift pump, front end | VP44 pump, lift pump, 53 block, APPS sensor | Injectors, lift pump, front end | Injectors, front end |
How to tell a 1998 12V from a 1998.5 24V
Open the hood and look at the driver side of the engine. A 12V has a long inline injection pump with six steel lines coming out of the top in a row. A 24V has a compact rotary VP44 pump with an electronic control unit mounted on top of it. The 8th character of the VIN is often cited as "D" for the 12V and "6" for the 24V, but confirm it with a VIN decoder before you order parts. Many 24V trucks also wear a "24 Valve" badge, but badges get swapped, so trust the engine.
2003-2004 vs 2004.5-2007
The injectors changed in the middle of 2004, and the two designs are not interchangeable. Running the wrong set causes rough running, high exhaust temperatures and possible engine damage. Check the engine data tag on the valve cover before ordering injectors or anything else listed for only one of these ranges.
Every product card shows the fitment listed on the product page. If your year range is not listed, the part does not fit your truck.
5.9L Cummins service schedule
Factory intervals were written for new trucks. Most 5.9s are now 20 to more than 30 years old with unknown history, so we recommend the severe column for any truck that tows, idles a lot, runs dirt roads, or has more than 200,000 miles. Your owner's manual, an oil analysis and your mechanic have the final word.
1994-1998 12V
| Item | Spec | Normal | Severe / towing |
|---|---|---|---|
| Engine oil and filter | About 12 quarts with filter. 15W-40 heavy duty diesel oil above 10°F | 6,000 miles or 6 months | 3,000 miles or 3 months |
| Fuel filter | Drain water from the separator at every oil change | Every other oil change (check your owner's manual) | Every other oil change, or any loss of power |
| Valve lash | 0.010 in. intake, 0.020 in. exhaust, engine cold | Check every 24,000 miles | Same |
| Coolant | About 6 gallons, 50/50 with distilled water | Test yearly | Test every 6 months |
| 47RH/47RE automatic | ATF+4. About 4 quarts on a pan drop | Fluid and filter every 30,000 miles, bands every 24,000 | Fluid, filter and bands every 15,000 miles |
| NV4500 manual | 75W-90 that meets the Syntorq spec, about 4 quarts. The wrong fluid ruins synchros | 60,000 miles | 30,000 miles |
| Killer dowel pin | One-time fix | If there is no record of it | Same |
| Front end | Track bar, drag link, tie rods, ball joints, steering box mount | Every oil change | Every oil change |
1998.5-2002 24V
| Item | Spec | Normal | Severe / towing |
|---|---|---|---|
| Engine oil and filter | About 12 quarts with filter. 15W-40 heavy duty diesel oil above 10°F | 7,500 miles or 6 months | 3,750 miles |
| Fuel filter | Fleetguard FS19598 or equivalent on 1998.5-1999, FS19855 on 2000-2002. Do not use the 2003-2007 filter on 2000-2002 trucks | 15,000 miles | 7,500 miles |
| Fuel supply pressure | Never below 5 psi. 12-15 psi is the target | Watch it on a gauge | Watch it on a gauge, especially when towing |
| Valve lash | 0.010 in. intake, 0.020 in. exhaust, engine cold | 150,000 miles (many owners check sooner) | Same |
| Coolant | About 6 gallons, 50/50 with distilled water | Flush every 30,000 miles / 2 years | Same, test yearly |
| 47RE automatic | ATF+4. About 4 quarts on a pan drop | Fluid, filter and bands every 30,000 miles | Every 15,000 miles |
| NV4500 / NV5600 manual | NV4500: Syntorq-spec 75W-90. NV5600: Mopar manual transmission fluid (4874464). They are not interchangeable | 60,000 miles | 30,000 miles |
| Front differential (Dana 60) | 75W-140 synthetic, about 3.15 quarts | Inspect | 30,000 miles |
| Front end | Track bar, ball joints, tie rods, steering box mount | Every oil change | Every oil change |
2003-2004 and 2004.5-2007
| Item | Spec | Normal | Severe / towing |
|---|---|---|---|
| Engine oil and filter | About 12 quarts with filter. 15W-40 above 0°F, or 5W-40 full synthetic | 15,000 miles or 6-12 months (check your owner's manual) | 7,500 miles or 6 months. Most owners use this interval |
| Fuel filter | 7 micron filter (Fleetguard FS19856 or equivalent). Drain water at every oil change | 15,000 miles | 7,500-10,000 miles |
| Coolant | About 7 gallons, 50/50 with distilled water | Flush every 100,000 miles / 5 years | Test yearly |
| 48RE automatic | ATF+4. About 4 quarts on a pan drop | Fluid, filter and bands every 100,000 miles (factory) | Every 30,000 miles |
| NV5600 / G56 manual | NV5600: Mopar 4874464. G56: ATF+4. Not interchangeable | 60,000 miles | 30,000 miles |
| Front differential (AAM 9.25) | 75W-90 synthetic, about 2.45 quarts | Inspect | 15,000 miles |
| Valve lash | 0.010 in. intake, 0.020 in. exhaust, engine cold | 150,000 miles | Same |
| Front end and U-joints | Grease front axle U-joints on 4x4 trucks | Every oil change | Every oil change |
Capacities are approximate. Fill to the dipstick or fill plug, and confirm fluid specs against your owner's manual.
Known failure points to fix first
1994-1998 12V
The killer dowel pin
Behind the timing cover, a small dowel pin locates the gear housing to the block. On 12-valve engines it can work loose and drop into the timing gears. The best case is a cracked timing cover. The worst case is a damaged gear train and a truck on a trailer. The fix is a small tab that bolts next to the pin and traps it so it cannot back out. You have to pull the timing cover, so replace the timing cover gasket and look at the front crank seal at the same time. If you bought the truck with no records, assume it has not been done.
Do first
BD Diesel 1040182 KDP Killer Dowel Pin Repair Kit
BD tab, bolt and tooling to lock the dowel pin in place on 1994-1998 12-valve engines. The most important part on this page for a 12V.
Listed fitment: 1994-1998 Dodge RAM 2500/3500 5.9L 12V Cummins
Check price and fitment
Mahle JV5072 Engine Timing Cover Gasket Set
Timing cover gasket set, so you are not reusing a decades-old gasket when the cover comes off.
Listed fitment: 1994-1998 Dodge RAM 2500/3500 5.9L 12V Cummins
Check price and fitment1994-1998 12V and 1998.5-2002 24V
Vacuum pump seal
On 1994-2002 trucks a gear-driven vacuum pump behind the power steering pump supplies the brake booster. Its shaft seal commonly leaks oil. A reseal kit is inexpensive. Index the drive gear carefully when it goes back together.
1998.5-2002 24V
The VP44 injection pump and its lift pump
The VP44 is cooled and lubricated by the fuel flowing through it, and about 70 percent of the fuel it receives goes back to the tank to carry heat away. When the lift pump gets weak, the VP44 runs hot and starved. The pump-mounted computer's solder joints fatigue with heat, and the pump fails. The classic symptoms are long cranking on hot restarts, stalling, and sudden loss of power. Many original VP44s were killed by a lift pump that nobody was watching.
Supply pressure should never drop below 5 psi, at idle or at full throttle under load, and 12-15 psi is the target. The only way to know is a gauge that stays on the truck. The factory electric lift pump is mounted on the block, where heat and vibration shorten its life. A frame-mounted lift pump with extra filtration, or an in-tank pump, is the standard fix.
Cheap insurance
BD Diesel 1081130 Low Fuel Pressure Light & Alarm Kit Red LED
BD low fuel pressure warning light and alarm. Warns you the moment supply pressure drops, before the VP44 pays for it.
Listed fitment: 1998-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
Best for most
FASS TSD08100G Titanium Signature Series 100GPH Fuel Lift Pump
FASS frame-mounted lift pump with added filtration and water separation. Plenty of flow for a stock or mildly upgraded 24V.
Listed fitment: 1998.5-2004 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
AirDog A7SABD525 II-5G 165 GPH Lift Pump
AirDog lift pump with air separation and filtration, with room to grow.
Listed fitment: 1998.5-2004 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
FASS DRP02 Stock Replacement Lift Pump
FASS stock replacement lift pump for 1998.5-2002. The budget fix when the original block-mounted pump is tired.
Listed fitment: 1998.5-2002 Dodge RAM 2500/3500 5.9L 24V Cummins
Check price and fitment
Fleece FPE-34754 Fuel System Upgrade Kit with PowerFlo Lift Pump
Fleece fuel system upgrade kit with an in-tank PowerFlo lift pump, for owners who prefer the pump in the tank.
Listed fitment: 1998.5-2002 Dodge RAM 2500/3500 5.9L 24V Cummins
Check price and fitment
Industrial 23K401 Bosch Overflow Valve Kit with Sealing Washers
Bosch overflow valve kit with new sealing washers. A stuck overflow valve can cause high pump fuel temperatures.
Listed fitment: 1998.5-2002 Dodge RAM 2500/3500 5.9L 24V Cummins
Check price and fitmentThe 53 block
Some 1999-2001 24-valve blocks with the number "53" cast into the side developed cracks in the water jacket on the passenger side, just below the freeze plugs. Look for "53" cast into the side of the block, usually on the passenger side and sometimes on the driver side, so check both. Then inspect the passenger side for coolant seepage or a crack. On automatic trucks the transmission cooler can hide the area, so look carefully. Heavy towing, overheating and skipping warm-up raise the risk. A crack is repaired with a cast iron stitching process such as Lock-N-Stitch, often with the engine still in the truck. Welding cast iron makes it worse.
Killer dowel pin on a 24V
The dowel pin is primarily a 12-valve problem. On 24-valve trucks it is low risk, but the tab is cheap insurance any time the timing cover is off. The Industrial Injection dowel pin kit is listed for 1994-2002 engines.
Accelerator pedal position sensor (APPS)
An intermittent dead pedal or surging on 1998.5-2002 trucks often traces to the APPS. Codes P0121, P0122, P0222 or P0223 point to it.
2003-2004 and 2004.5-2007
Injectors
Dirt and water are what kill common rail injectors. Early 2003-2007 injectors often needed attention between 100,000 and 150,000 miles. Warning signs include hard or no starts, a rough idle, a knock, white vapor from the tailpipe at startup, fuel in the oil, and heavy blow-by from the oil fill. A return flow test settles it: excess return flow means worn injectors.
Replace injectors as a set and always install new connector tubes with them. Remember that 2003-2004 and 2004.5-2007 injectors are different designs and are not interchangeable.
2003-2004
Stock replacement
BD Diesel 1715503 Stock Fuel Injector
BD remanufactured stock replacement injector for 2003-2004 trucks. Sold individually, so order six, and install new connector tubes with them.
Listed fitment: 2003-2004 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
Industrial F00RJ01572 Connecting Tube
Injector connector tube. Replace one with every injector you install.
Listed fitment: 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
BD Diesel 1050155 Fuel Injector Install Kit
BD injector install kit with the seals and connector tubes for 2003-2005 trucks.
Listed fitment: 2003-2005 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment2004.5-2007
Stock replacement
Industrial 0986435505SE-IIS Reman Stock Injector
Remanufactured stock injector for 2004.5-2007 trucks. The right choice for keeping a work truck stock. Order six.
Listed fitment: 2004.5-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
BD Diesel 1714505 Stock Performance Plus Fuel Injector 5-15HP
BD Stock Performance Plus injector for 2004.5-2007, rated for about 5-15 hp over stock.
Listed fitment: 2004.5-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitmentBD Diesel 1050155 Fuel Injector Install Kit
BD injector install kit with seals and connector tubes. Listed for 2003-2005, so on this range it fits 2004.5-2005 trucks only.
Listed fitment: 2003-2005 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitmentIndustrial F00RJ01572 Connecting Tube
Injector connector tube. Replace one with every injector you install.
Listed fitment: 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitmentLift pump and supply
The CP3 itself is robust, but it needs a steady supply. The factory pump makes about 10-11.5 psi at idle and drops under load. Below about 5 psi the CP3 is not getting enough fuel. On 2003-2004 trucks the factory pump is mounted on the block. Many were moved into the tank under warranty, and 2005-2007 trucks came with the pump in the tank. Lift pump kits are sold in versions for both, so check yours before ordering. A frame-mounted lift pump with extra filtration also adds protection for the injectors.
2003-2004
FASS DRP04 Stock Replacement Lift Pump
FASS stock replacement lift pump for 2003-2004 trucks with the block-mounted pump.
Listed fitment: 2003-2004 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
Best for most
FASS TSD08100G Titanium Signature Series 100GPH Fuel Lift Pump
FASS frame-mounted lift pump with added filtration for 1998.5-2004 trucks.
Listed fitment: 1998.5-2004 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
AirDog A7SPBD354 II-5G 100GPH Lift Pump
AirDog lift pump for 1998.5-2004 trucks that have already been converted to an in-tank pump.
Listed fitment: 1998.5-2004 Dodge RAM 2500/3500 5.9L Cummins with In-Tank Fuel Pump
Check price and fitment2004.5-2007
2004.5 trucks are 2004 model year trucks, so they still have the block-mounted lift pump unless it has been moved. Pick 2003-2004 at the top of the page to see those pumps. The in-tank pump arrived with the 2005 model year.
Best for most
FASS TSD07100G Titanium Signature Series 100GPH Lift Pump
FASS frame-mounted lift pump with added filtration for 2005 and newer trucks with the in-tank pump.
Listed fitment: 2005-2018 & 2021-2024 RAM 2500/3500 5.9L/6.7L Cummins
Check price and fitment
Fleece FPE-34560 170GPH PowerFlo In-Tank Lift Pump
Fleece PowerFlo in-tank lift pump for 2005-2009 trucks, a direct upgrade of the factory in-tank pump.
Listed fitment: 2005-2009 Dodge RAM 5.9L/6.7L 2500/3500 Cummins
Check price and fitmentBD Diesel 1081130 Low Fuel Pressure Light & Alarm Kit Red LED
BD low fuel pressure light and alarm. Warns you when supply pressure drops.
Listed fitment: 1998-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitmentFuel control actuator and rail pressure relief valve
A rough idle, low power or a no-start can come from the fuel control actuator (FCA) on the CP3. If the truck starts only with the FCA unplugged, it is the likely culprit. A rail pressure relief valve that sticks open keeps the rail from building the pressure it needs to start.
Fuel system and filtration
1994-1998 12V
The 12V's P7100 pump is mechanical and famously tough, and it tolerates weak supply pressure far better than the VP44 on later trucks. That tolerance is why many owners never check it. But the factory lift pump is a cam-driven mechanical pump that is decades old on most trucks, and a weak one shows up as lost power on long pulls and hard starts. Tee a gauge into the line feeding the injection pump and check pressure at idle and under load. Change the fuel filter before you blame the pump, since a clogged filter looks the same.
Best for most
FASS TSD10180F140G Titanium Signature Series 140GPH Fuel Lift Pump
FASS lift pump with added filtration for 1994-1998 12V. Enough flow for stock and mild builds.
Listed fitment: 1994-1998 Dodge RAM 2500/3500 5.9L 12V Cummins
Check price and fitment
AirDog A7SABD524 II-5G 165GPH Lift Pump
AirDog lift pump with air separation and more flow headroom.
Listed fitment: 1994-1998 Dodge RAM 2500/3500 5.9L 12V Cummins
Check price and fitmentInjectors
Injector nozzles wear. On a high mileage 12V, worn injectors show up as rough idle, harder cold starts, lower fuel economy and higher exhaust gas temperatures. Replace them as a matched set. For a maintenance minded truck, stay as close to stock flow as you can. We do not list a true stock flow 12V set right now, so the mildest option is below, and our sales team can help you source stock replacements. Larger injectors are a performance decision, not a maintenance one.
Mildest option
BD Diesel 1040277 Fuel Injector Set
BD exchange injector set rated for about 45 hp over stock. The mildest set we list for the 12V, and a good match for a towing truck with worn injectors.
Listed fitment: 1994-1998 Dodge RAM 2500/3500 5.9L 12V Cummins
Check price and fitment
Industrial 0432131715-IIS 80HP Reman Marine Injector
Remanufactured marine-style injector rated for about 80 hp over stock. A performance step, not a stock replacement. Sold individually, so order six.
Listed fitment: 1994-1998 Dodge RAM 2500/3500 5.9L 12V Cummins
Check price and fitment1998.5-2002 24V
Use the right fuel filter for your year: 1998.5-1999 trucks and 2000-2002 trucks use different cartridges, and the 2003-2007 filter should not be used on 2000-2002 trucks even though it can physically fit. Change it every 15,000 miles, or 7,500 when towing, and drain water from the separator at every oil change.
The factory banjo bolts in the fuel supply line are small and restrictive. Upgraded banjo bolts are a cheap way to help the lift pump keep pressure up. Injectors on the 24V wear like any other. For a work truck, replace them as a matched set at or near stock flow. The set we list below is a performance step, so call our sales team if you want a stock flow set.
BD Diesel 1050220 Banjo Bolt Upgrade Kit
BD upgraded banjo bolts for 2000-2002. Removes a known restriction in the supply line.
Listed fitment: 2000-2002 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
BD Diesel 1075822 75HP Fuel Injector Set
BD injector set rated for about 75 hp over stock. A performance step, not a stock replacement. For a stock flow set, call our sales team.
Listed fitment: 1998.5-2002 Dodge RAM 2500/3500 5.9L 24V Cummins
Check price and fitment
BD Diesel 1075800 Fuel Injector Seal Kit
Injector seal kit. Replace seals any time an injector comes out.
Listed fitment: 1998.5-2002 Dodge RAM 2500/3500 5.9L 24V Cummins
Check price and fitment
BD Diesel 1040281 ISB Fuel Injector Connector Feed Tubes Set
Injector connector feed tubes for 1998.5-2002 24V.
Listed fitment: 1998.5-2002 Dodge RAM 2500/3500 5.9L 24V Cummins
Check price and fitment2003-2004 and 2004.5-2007
The 2003-2007 trucks use a 7 micron fuel filter in the engine-mounted housing, with a water separator and a water in fuel sensor. Change it every 15,000 miles, more often if you tow or buy fuel from low-volume stations, and drain water at every oil change. Clean fuel is the single best thing you can do for common rail injectors.
Best value
AFE 44-FF010-MB Pro-Guard D2 High Efficiency 3 Micron Fuel Filter (4 Pack)
Four pack of aFe 3 micron fuel filters. The listing says 2000-2007, but use these on 2003-2007 trucks only. 2000-2002 VP44 trucks take the FS19855 style filter.
Listed fitment: 2000-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
Fleece FPE-34783 Auxiliary Fuel Filter Kit
Fleece auxiliary fuel filter kit. Adds a second stage of filtration ahead of the factory filter.
Listed fitment: 2003-2018 Dodge RAM 5.9L/6.7L 2500/3500 Cummins
Check price and fitment
Industrial Injection 0281006325 High Pressure Rail Sensor
Replacement rail pressure sensor for 2003-2007, if diagnostics point to it.
Listed fitment: 2003-2007 Dodge RAM 2500/3500 5.9L Cummins 2500 / 3500
Check price and fitmentOil and filtration
Every 5.9 holds about 12 quarts with the filter. A quality heavy duty 15W-40 diesel oil is the right choice for most trucks, and 2003-2007 trucks can also run a 5W-40 full synthetic in any temperature. Older engines with more blow-by benefit from the shorter end of the interval range. An oil analysis once a year catches coolant or fuel in the oil early, which matters most on a 53 block 24V or a common rail truck with tired injectors.
The air filter matters as much as the oil filter on a dusty ranch road. Replace it based on the restriction indicator or inspection, not mileage, and consider a pre-filter wrap on an aftermarket intake.
Best value
AFE 44-LF002-MB Pro-Guard D2 Replacement Oil Filter (4 Pack)
Four pack of aFe Pro-Guard D2 oil filters. Fits every 5.9 and covers a year of changes in one order.
Listed fitment: 1989-2024 Dodge RAM 5.9L/6.7L 2500/3500 Cummins
Check price and fitment
PPE 214000767 MicroPure XR® Engine Oil Filter
PPE MicroPure XR oil filter for 1989-2024 Cummins.
Listed fitment: 1989-2024 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Check price and fitment
S&B WF-1023 Filter Wrap
Pre-filter wrap for an aftermarket air filter. Keeps dust and water off the element on ranch and gravel roads.
Listed fitment: 1994-2009 Dodge RAM 2500/3500 2001-2007 GM 2500/3500
Check price and fitmentCooling system
Most 5.9 cooling problems come down to age: hardened hoses, weak radiator caps, tired water pumps and thermostats that no longer open on time. If you tow in heat, cooling is where your reliability is won or lost. Use a 50/50 mix of a quality antifreeze and distilled water, never mix coolant types, and test it with strips. Coolant additives wear out, so test the protection level, not just the freeze point. Check the water pump weep hole every 15,000 miles.
1994-1998 12V
On 12-valve trucks, the coolant bypass and heater lines are common age-related leak points, and the stock thermostat is 180°F. Stainless braided replacement lines end the leaks for good. A lower temperature thermostat helps trucks that tow in hot climates. In cold climates, stay with a stock temperature thermostat.
Mishimoto MMTS-RAM-94L 174° Thermostat
174° thermostat for 1994-1998 12V. Best for hot climate towing.
Listed fitment: 1994-1998 Dodge RAM 2500/3500 5.9L 12V Cummins
Check price and fitment
Fleece FPE-CLNTBYPS-12V Cummins-12V Coolant Bypass Kit
Fleece coolant bypass kit. Replaces an aging factory bypass with a long-life setup.
Listed fitment: 1994-1998 Dodge RAM 2500/3500 5.9L 12V Cummins
Check price and fitment
Fleece FPE-CUMM-SSHCL-12V Replacement Heater Core Line Kit for 12V
Fleece heater core line kit. Fixes leaking heater lines for good.
Listed fitment: 1994-1998 Dodge RAM 2500/3500 5.9L 12V Cummins
Check price and fitment1998.5-2002 24V
On a 24V, keep an eye on coolant level if you have a 53 block. Unexplained coolant loss with no visible leak is a reason to look closely at the passenger side of the block.
Mishimoto MMTS-RAM-99L Low-Temperature Thermostat
Mishimoto lower temperature thermostat for 1999 and newer 5.9 and 6.7.
Listed fitment: 1999-2013 Dodge RAM 5.9L/2500/3500 6.7L Cummins
Check price and fitment
Mishimoto MMHOSE-RAM-98DBK Black Silicone Coolant Hose Kit
Silicone coolant hose kit for 1998.5-2002 24V. Replaces cracked factory hoses.
Listed fitment: 1998.5-2002 Dodge RAM 2500/3500 5.9L 24V Cummins
Check price and fitment
Fleece FPE-CLNTBYPS-24V Cummins-VP-SS VP Coolant Bypass Kit with Stainless Steel Braided Line
Fleece coolant bypass kit with stainless braided line for 1998.5-2002 24V.
Listed fitment: 1998.5-2002 Dodge RAM 2500/3500 5.9L 24V Cummins
Check price and fitment2003-2004 and 2004.5-2007
On 2003-2007 trucks the rear cylinder runs hottest, especially when towing. A coolant bypass kit that improves flow to the back of the head is a common, inexpensive upgrade.
Fleece FPE-CLNTBYPS-CUMMINS-0305 Coolant Bypass Kit
Fleece coolant bypass kit for 2003-2005. Improves flow to the rear of the head.
Listed fitment: 2003-2005 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
Fleece FPE-CLNTBYPS-CUMMINS-0607 Coolant Bypass Kit
Fleece coolant bypass kit for 2006-2007.
Listed fitment: 2006-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitmentMishimoto MMTS-RAM-99L Low-Temperature Thermostat
Mishimoto lower temperature thermostat for 1999 and newer trucks.
Listed fitment: 1999-2013 Dodge RAM 5.9L/2500/3500 6.7L Cummins
Check price and fitment
Mishimoto MMHOSE-RAM-03DBL Blue Silicone Coolant Hose Kit
Silicone coolant hose kit for 2003-2010 Cummins.
Listed fitment: 2003-2010 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Check price and fitmentHarmonic damper
The factory damper is 20 to more than 30 years old on most of these trucks. A worn damper lets crankshaft vibration through to the gear train and accessories. If yours wobbles, shows cracks or is leaking, replace it.
1994-1998 12V
Fluidampr 960311 Internal Balance Steel Black Zinc Finish O.D. 9-3/4 inch Performance Damper
Fluidampr internally balanced damper for 1992-1998 12V.
Listed fitment: 1992-1998 Dodge RAM 2500/3500 5.9L 12V Cummins
Check price and fitment1998.5-2002 24V
Fluidampr 960301 Internal Balance Steel Black Zinc Finish O.D. 9-3/4 inch Performance Damper
Fluidampr internally balanced damper for 1998-2002 24V.
Listed fitment: 1998-2002 Dodge RAM 2500/3500 5.9L 24V Cummins
Check price and fitment2003-2004 and 2004.5-2007
Fluidampr 920301 Internal Balance Steel Black Zinc Finish O.D. 9-1/4 In. Performance Damper
Fluidampr internally balanced damper for 2003-2009 Cummins.
Listed fitment: 2003-2009 Dodge RAM 5.9L/6.7L 2500/3500 Cummins
Check price and fitmentCharge air, exhaust manifold and turbo
A boost leak costs power and fuel economy and drives up exhaust gas temperatures. Intercooler boots crack with age and clamps loosen. Check them at every oil change and pressure test the system if power falls off. The long one-piece exhaust manifold on the 5.9 also cracks from heat cycling. A tick that rises with rpm, along with lower boost, is the giveaway. A multi-piece manifold with slip joints is the permanent fix. On high mileage trucks, check the turbo for shaft play and oil in the intake while the boots are off.
1994-1998 12V and 1998.5-2002 24V
Most needed
Mishimoto MMBK-RAM-94BK Factory Boot Kit
Mishimoto factory-style boot kit for 1994-2002. Replaces every intercooler boot.
Listed fitment: 1994-2002 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
Mishimoto MMINT-RAM-94KSL Silver Intercooler Kit
Mishimoto intercooler kit for 1994-2002. The fix for a leaking or tired factory intercooler.
Listed fitment: 1994-2002 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
AFE 46-20064-B BladeRunner 3" Intercooler Tube Kit (Black)
aFe 3 inch intercooler tubes with new couplers and clamps.
Listed fitment: 1994-2002 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
BD Diesel 1045981 Exhaust Manifold Gasket Set
BD exhaust manifold gasket set for 12V engines.
Listed fitment: 1988-1998 Dodge RAM 2500/3500 5.9L 12V Cummins
Check price and fitment
BD Diesel 1045986 Exhaust Manifold Gasket Set for Stock Mount Turbo
BD exhaust manifold gasket set for 1998.5-2007 stock mount turbos.
Listed fitment: 1998.5-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
ATS 204-930-2218 T3 3-Piece Pulse Flow Exhaust Manifold Kit
ATS three-piece pulse flow exhaust manifold for 24V. Slip joints stop the cracking.
Listed fitment: 1998.5-2002 Dodge RAM 2500/3500 5.9L 24V Cummins
Check price and fitment
ATS 204-930-2164 T3 3 Piece Pulse Flow Exhaust Manifold Kit
ATS three-piece pulse flow exhaust manifold for 12V.
Listed fitment: 1994-1998 Dodge RAM 2500/3500 5.9L 12V Cummins
Check price and fitment2003-2004 and 2004.5-2007
BD Diesel 1045987 Pulse Exhaust Manifold for Stock Mount Turbos
BD pulse exhaust manifold for 2003-2007. A multi-piece design that ends manifold cracking.
Listed fitment: 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitmentBD Diesel 1045986 Exhaust Manifold Gasket Set for Stock Mount Turbo
BD exhaust manifold gasket set for stock mount turbos.
Listed fitment: 1998.5-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
ARP 447-1101 SS Hex Exhaust Manifold Bolt Kit
ARP stainless exhaust manifold bolt kit.
Listed fitment: 2003-2026 Dodge RAM 2500/3500 5.9/6.7L Cummins No Spacers
Check price and fitmentHead gasket, studs and gaskets
A stock 5.9 rarely needs a head gasket. Trucks that tow heavy with added fuel are a different story. If the head comes off for any reason, install head studs. They clamp the head more evenly than factory bolts and turn a recurring repair into a one-time job. Valve lash is the other engine job owners skip: 0.010 in. intake and 0.020 in. exhaust, set with the engine cold.
1994-1998 12V
Mahle HS4068 Head Gasket Set
Mahle head gasket set for 1989-1998 12V.
Listed fitment: 1989-1998 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
PPE 218034200 Head Stud Kit
PPE head stud kit for 1989-1998 12V. Strong value for towing trucks.
Listed fitment: 1989-1998 Dodge RAM 2500/3500 5.9L 12V Cummins
Check price and fitment
Gator Fasteners HSK5912 Head Stud Kit
Gator Fasteners head stud kit, a popular alternative.
Listed fitment: 1989-1998.5 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment1998.5-2002 24V
Mahle HS541742 Head Gasket Set
Mahle head gasket set for 1998.5-2002 24V.
Listed fitment: 1998.5-2002 Dodge RAM 2500/3500 5.9L 24V Cummins
Check price and fitment
PPE 218034300 Head Stud Kit
PPE head stud kit for 1998.5 and newer 5.9 and 6.7.
Listed fitment: 1998.5-2024 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Check price and fitment
ARP 247-4202 Pro Series Head Stud Kit
ARP head stud kit for 1998.5 and newer.
Listed fitment: 1998.5-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Check price and fitment
Cometic C5614 ISB Valve Cover Gasket Kit
Valve cover gasket kit for a 24V. Replace it when you set valve lash.
Listed fitment: 1998-2002 Dodge RAM 2500/3500 5.9L 24V Cummins
Check price and fitment2003-2004 and 2004.5-2007
Mahle HS54556 1.20MM Head Gasket Set
Mahle head gasket set for 2003-2007.
Listed fitment: 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitmentPPE 218034300 Head Stud Kit
PPE head stud kit for 1998.5 and newer.
Listed fitment: 1998.5-2024 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Check price and fitment
Mahle VS50419 Rocker Box Gasket
Rocker box gasket. Replace it when you set valve lash.
Listed fitment: 2003-2018 Dodge RAM 2500/3500 Cummins
Check price and fitmentSteering and front end
The front end is the most common reason owners fall out of love with an otherwise great Ram. Worn track bar bushings, drag link and tie rod ends, ball joints, unit bearings and a steering box that flexes the frame all add up to wandering, loose steering and death wobble. On many high mileage Rams, the front end is worn out. Fix the parts, not the symptom.
- With the engine running and the truck on the ground, have someone turn the wheel back and forth while you watch the track bar ends and steering linkage. Any visible slop is a worn part.
- Check the steering box mounting area of the frame for cracks. A steering box brace prevents them.
- Replace worn links as a system, then align the truck. A new stabilizer goes on last, not first.
1994-1998 12V and 1998.5-2002 24V
Full fix
Synergy 8525-03 Truck Heavy Duty Steering Kit
Synergy heavy-duty steering kit. Replaces the drag link and tie rod in one package. Listed for 1994-1999 4WD.
Listed fitment: 1994-1999 Dodge RAM 1500/2500/3500 4WD
Check price and fitment
Synergy 4803-41 Track Bar Dual Durometer Bushing In Forged Housing 14MM Bolt 1.60 inch Wide
Synergy dual durometer track bar bushing. Fixes the most common source of slop.
Listed fitment: 1994-2007 Dodge RAM 1500/2500/3500
Check price and fitment
Synergy 8557-04 Steering Box Brace
Synergy steering box brace for 1994-2002 4WD. Supports the box and protects the frame.
Listed fitment: 1994-2002 Dodge RAM 4WD 1500/2500/3500
Check price and fitment
BD Diesel 1032002 Steering Box Stabilizer Bar
BD steering box stabilizer bar for 1994-2002, another proven brace.
Listed fitment: 1994-2002 Dodge RAM 1500/2500/3500
Check price and fitment
Rough Country 8732330 Steering Stabilizer
Rough Country stabilizer. Install after the worn parts are replaced.
Listed fitment: 1994-2012 Dodge RAM 2500/3500 5.9L/6.7L Cummins 4WD
Check price and fitment2003-2004 and 2004.5-2007
Synergy 8567-11 Heavy Duty Drag Link
Synergy heavy-duty drag link for 2003-2013 4WD.
Listed fitment: 2003-2013 Dodge RAM 1500/2500/3500 4WD
Check price and fitment
Apex KIT101 Super HD Ball Joint Kit (2) BJ130, (2) BJ131
Apex super heavy-duty ball joint kit for 2003-2013 4WD.
Listed fitment: 2003-2013 Dodge RAM 2500/3500 4WD
Check price and fitment
BD Diesel 1302033-1 Track Bar Bushing Set
BD track bar bushing set. A cheap fix for the most common source of slop.
Listed fitment: 1994-2011 Dodge RAM 2500/3500
Check price and fitment
BD Diesel 1032003 Steering Box Stabilizer Bar
BD steering box stabilizer bar for 2003 and newer. Ties the frame rails together and supports the box.
Listed fitment: 2003-2018 Dodge RAM 2500/3500
Check price and fitment
Synergy 8550-11 Adjustable Track Bar
Synergy adjustable track bar for 2003-2013, if the factory bar is worn out.
Listed fitment: 2003-2013 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Check price and fitment
Bilstein 24-164870 B8 5100 Steering Damper Stabilizer - Cantilever to eye - (Single)
Bilstein 5100 steering damper for 2003-2007.5 4WD. Install it last.
Listed fitment: 2003-2007.5 Dodge RAM 2500/3500 4WD
Check price and fitmentTransmission and clutch
1994-1998 12V
47RH (1994-1995) and 47RE (1996-1998) automatic
The 4-speed automatic is the weak link behind any 12V that tows. Change the fluid (ATF+4) and filter and adjust both bands on schedule. On 1996-1998 47RE units, erratic shifting or no upshift is often the governor pressure solenoid or sensor, not a failed transmission. If it is already slipping, service will not save it, and a rebuild with upgraded parts is the right call.
ATS 3031002188 Governor Pressure Solenoid Conversion
ATS governor pressure solenoid conversion. Fixes a common 47RE shifting problem.
Listed fitment: 1996-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
SunCoast SK-47RE Transgo Shift Kit
SunCoast Transgo shift kit. Firmer shifts mean less clutch slip and heat.
Listed fitment: 1994-2003 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
SunCoast 618-UDS Transmission Dipstick
SunCoast locking dipstick for accurate fluid checks.
Listed fitment: 1994-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitmentNV4500 5-speed manual
The NV4500 is close to bulletproof, but clutches wear and the hydraulics fail with age. Use a 75W-90 that meets the Syntorq spec. The wrong fluid ruins synchros. Lugging in 5th gear with a trailer can loosen the 5th gear nut, so downshift on hills.
Valair NMU70119 Stock Replacement Clutch Kit
Valair stock replacement clutch kit for 1994-2003.
Listed fitment: 1994-2003 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
Valair NMU70119-04 Heavy-Duty Replacement Clutch Kit
Valair heavy-duty replacement clutch for towing or added power.
Listed fitment: 1994-2003 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
South Bend Clutch HYD-HD Heavy-Duty Replacement Hydraulics
South Bend heavy-duty hydraulics for 1994-1997 12V.
Listed fitment: 1994-1997 Dodge RAM 2500/3500 5.9L 12V Cummins
Check price and fitment1998.5-2002 24V
47RE automatic
Change the ATF+4 and filter and adjust both bands every 30,000 miles, or every 15,000 if you tow. Starting in 2nd gear, harsh or delayed shifts, or no overdrive often trace to the governor pressure solenoid or sensor inside the pan. Replace both together with a fluid and filter service. A deep pan adds fluid capacity and helps with heat.
Common fix
ATS 3031002188 Governor Pressure Solenoid Conversion
ATS governor pressure solenoid conversion for 1996-2007.
Listed fitment: 1996-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitmentSunCoast SK-47RE Transgo Shift Kit
SunCoast Transgo shift kit. Firmer shifts reduce slip and heat.
Listed fitment: 1994-2003 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
BD Diesel 1061501 727/518/47RH/47RE/48RE Deep Sump Transmission Pan
BD deep sump transmission pan. More fluid, better cooling.
Listed fitment: 1989-2007 Dodge RAM 1500/2500/3500
Check price and fitment
ATS 601-947-2218 47RE APPS/TPS Signal Conditioner
ATS APPS/TPS signal conditioner for 1998.5-2002 47RE trucks.
Listed fitment: 1998.5-2002 Dodge RAM 2500/3500 5.9L 24V Cummins
Check price and fitmentIf the transmission is already slipping under load, a rebuild with upgraded parts is the right answer. SunCoast's 47RE kits come in categories by power and use, starting with a Category 1 kit with converter for stock towing trucks.
NV4500 and NV5600 manuals
The NV4500 takes a 75W-90 that meets the Syntorq spec. The NV5600 six-speed, offered from 1999 and the only manual behind the 2001-2002 High Output engine, takes Mopar manual transmission fluid. The two are not interchangeable. If the clutch pedal feels soft or the clutch will not fully release, check the hydraulics first.
Valair NMU70119 Stock Replacement Clutch Kit
Valair stock replacement clutch kit for 1994-2003 trucks.
Listed fitment: 1994-2003 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
Valair NMU70279-01 Heavy-Duty Replacement Clutch Kit
Valair heavy-duty replacement clutch for 2000-2005 trucks.
Listed fitment: 2000-2005 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
South Bend Clutch HYDX1.50 Upgraded Master and Slave Cylinder HYDX1.50
South Bend upgraded master and slave cylinder for 1998-2002.
Listed fitment: 1998-2002 Dodge RAM 2500/3500/4500 5.9L Cummins
Check price and fitment2003-2004 and 2004.5-2007
48RE automatic
The 48RE is stronger than the 47RE, but heat is still its enemy. The factory interval is long, so if you tow, change the ATF+4 and filter and adjust the bands every 30,000 miles. A deep pan adds capacity and cooling. Governor pressure problems show up as erratic shifting or starting in 2nd. A stock 48RE can slip once power is added.
Common fix
ATS 3031002188 Governor Pressure Solenoid Conversion
ATS governor pressure solenoid conversion for 1996-2007.
Listed fitment: 1996-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
BD Diesel 1060602 Pressure Transducer Upgrade Kit
BD pressure transducer upgrade kit for 2000-2007.
Listed fitment: 2000-2007 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitmentBD Diesel 1061501 727/518/47RH/47RE/48RE Deep Sump Transmission Pan
BD deep sump transmission pan. More fluid, better cooling.
Listed fitment: 1989-2007 Dodge RAM 1500/2500/3500
Check price and fitmentNV5600 and G56 manuals
The NV5600 was used through 2005, then the G56 took over during the 2005 model year. They take different fluids: Mopar manual transmission fluid in the NV5600, ATF+4 in the G56. The factory dual mass flywheel does not handle added power well, and many owners replace it with a single mass clutch kit.
Valair NMU70279-01 Heavy-Duty Replacement Clutch Kit
Valair heavy-duty replacement clutch for 2000-2005 NV5600 trucks.
Listed fitment: 2000-2005 Dodge RAM 2500/3500 5.9L Cummins
Check price and fitment
South Bend Clutch G56-OR-HD Full HD Organic Clutch Kit
South Bend heavy-duty organic clutch kit for G56 trucks.
Listed fitment: 2005-2018 Dodge RAM 2500/3500/4500 5.9L/6.7L 2500/3500 Cummins
Check price and fitment
South Bend Clutch HYDX.750 Adjustable Hydraulic Assembly
South Bend adjustable hydraulic assembly for G56 trucks.
Listed fitment: 2003-2018 Dodge RAM 2500/3500 with G56 Transmission
Check price and fitmentWeekend refresh checklist
Just bought a high mileage 5.9, or getting yours ready for towing season? This is the order we would do it in.
1994-1998 12V
| Step | Job | Parts |
|---|---|---|
| 1 | Killer dowel pin and timing cover gasket | BD KDP kit, Mahle timing cover gasket set |
| 2 | Oil, fuel filter, coolant test, air filter inspection | aFe oil filter 4-pack |
| 3 | Thermostat and leaking lines | Mishimoto thermostat, Fleece heater line kit |
| 4 | Fuel pressure test, lift pump if weak | FASS 140 GPH |
| 5 | Front end inspection and repair | track bar bushing, steering box brace |
| 6 | Transmission service and band adjustment | shift kit at the next pan drop |
1998.5-2002 24V
| Step | Job | Parts |
|---|---|---|
| 1 | Install a fuel pressure gauge or alarm | BD low pressure alarm |
| 2 | Lift pump if pressure is ever below 5 psi | FASS 100 GPH or FASS stock replacement |
| 3 | Oil and the correct fuel filter for your year | aFe oil filter 4-pack |
| 4 | Inspect for a 53 block and coolant seepage | Flashlight and a mirror |
| 5 | 47RE fluid, filter and bands | governor pressure solenoid conversion if shifting is erratic |
| 6 | Front end inspection and repair | track bar bushing, steering box brace |
2003-2004 and 2004.5-2007
| Step | Job | Parts |
|---|---|---|
| 1 | Oil and fuel filter, drain water | aFe oil filter 4-pack, aFe fuel filter 4-pack |
| 2 | Check supply pressure and lift pump location | BD low pressure alarm |
| 3 | Injector health: idle quality and return flow test | Connector tubes with any injector change |
| 4 | Exhaust manifold and boot leaks | manifold gasket set |
| 5 | Front end inspection and repair | track bar bushings, steering box brace |
| 6 | Transmission service | deep pan at the next service |
Shop parts for your truck
1994-1998 12V
1998.5-2002 24V
2003-2004
2004.5-2007
Not sure which parts your truck needs?
Alligator's sales team works with 5.9 Cummins owners every day. Tell us your year, mileage and how you use the truck, and we will help you put together the right maintenance parts list and confirm fitment before you order.
Call 208-719-7400Send us a messageFrequently asked questions
How do I know if my 1998 Ram has the 12V or the 24V Cummins?
Look at the injection pump on the driver side of the engine. A long inline pump with six lines in a row is a 12V. A compact rotary VP44 pump with an electronic module on top is a 24V. The 8th character of the VIN is often cited as D for the 12V and 6 for the 24V, but confirm it with a VIN decoder.
How much oil does a 5.9 Cummins hold?
About 12 quarts with the filter on every 5.9 from 1994 to 2007. A heavy duty 15W-40 diesel oil is the common choice, and 2003-2007 trucks can also run a 5W-40 full synthetic.
What fuel pressure does a VP44 need?
Supply pressure should never drop below 5 psi at any time, including full throttle under load, and 12-15 psi is the target. Keep a gauge or a low pressure alarm on the truck so you know.
What are the signs of a failing VP44?
Long cranking on hot restarts, stalling, sudden loss of power and a P0216 code. Check lift pump pressure first, because a weak lift pump is the most common reason VP44s fail.
Do I have a 53 block?
Look for the number 53 cast into the side of the block, usually on the passenger side and sometimes on the driver side. Only 1999-2001 24-valve blocks with that casting have a documented cracking pattern, on the passenger side below the freeze plugs. If you find one, check it regularly for coolant seepage.
Do I need a killer dowel pin fix on a 24V?
The dowel pin is primarily a 12-valve problem. On a 24V it is low risk, but the tab is inexpensive insurance any time the timing cover is off.
Which fuel filter does my 5.9 use?
1998.5-1999 and 2000-2002 trucks use different cartridges, and 2003-2007 trucks use a 7 micron filter. Do not use the 2003-2007 filter on a 2000-2002 VP44 truck, even though it can fit.
Are 2003-2004 and 2004.5-2007 injectors the same?
No. They are different designs and are not interchangeable. Running the wrong set causes rough running and high exhaust temperatures. Check the engine data tag on the valve cover before ordering.
Where is the lift pump on a 2003-2007 Cummins?
On 2003-2004 trucks the factory pump is on the block, though many were moved into the tank. On 2005-2007 trucks it is in the tank. Lift pump kits are sold in versions for each, so check yours first.
What manual transmission fluid does my 5.9 need?
The NV4500 takes a 75W-90 that meets the Syntorq spec, the NV5600 takes Mopar manual transmission fluid, and the G56 takes ATF+4. They are not interchangeable, and the wrong one can ruin synchros.
What is the valve lash spec for a 5.9 Cummins?
0.010 inch intake and 0.020 inch exhaust, set with the engine cold, on both the 12-valve and 24-valve engines.
How do I fix death wobble on my Ram?
Start with the track bar and its bushings, then the ball joints, tie rod ends and drag link, then align the truck. A steering stabilizer hides the symptom but does not fix the worn parts.
More diesel maintenance guides
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