2003-2004 Ram 2500/3500 5.9L Cummins Engine & Performance

2003-2004 Ram 2500/3500 5.9L Cummins Crate Engines

Crate Engines

2003-2004 Ram 2500/3500 5.9L Cummins Gaskets, Gasket Kits & Bearings

Gaskets, Gasket Kits & Bearings

2003-2004 Ram 2500/3500 5.9L Cummins Head Studs & Main Studs

Head Studs & Main Studs

2003-2004 Ram 2500/3500 5.9L Cummins Heads & Valve Train

Heads & Valve Train

2003-2004 Ram 2500/3500 5.9L Cummins Oil Pans

Oil Pans

2003-2004 Ram 2500/3500 5.9L Cummins Radiators & Cooling Upgrades

Radiators & Cooling Upgrades

2003-2004 Ram 2500/3500 5.9L Cummins Rebuild Kits & Internal Parts

Rebuild Kits & Internal Parts

2003-2004 Ram 2500/3500 5.9L Cummins Rods, Pistons, Cams & More

Rods/Pistons/Cams & More

Loading products...
Filter
202 products
Sort by:
Best selling
Industrial 244110 ISB X-Series Piston Kit (Standard) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244110 ISB X-Series Piston Kit (Standard) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244110 ISB X-Series Piston Kit (Standard) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

Industrial Injection

Industrial 244110 ISB X-Series Piston Kit (Standard) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

SKU: IIS244110
$1,260.95
$1,299.95
SAVE $39
D&J Precision DJPSB100019 Essential Short Block Engine | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins
D&J Precision DJPSB100019 Essential Short Block Engine | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins
D&J Precision DJPSB100019 Essential Short Block Engine | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins

D&J Precision

D&J Precision DJPSB100019 Essential Short Block Engine | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins

SKU: DNJDJPSB100019
$5,953.99
$6,267.99
SAVE $314
D&J Precision DJPSB100018 Plus Short Block Engine | 2003-2004.5 Dodge RAM 2500/3500 5.9L Cummins
D&J Precision DJPSB100018 Plus Short Block Engine | 2003-2004.5 Dodge RAM 2500/3500 5.9L Cummins
D&J Precision DJPSB100018 Plus Short Block Engine | 2003-2004.5 Dodge RAM 2500/3500 5.9L Cummins
D&J Precision DJPSB100018 Plus Short Block Engine | 2003-2004.5 Dodge RAM 2500/3500 5.9L Cummins
D&J Precision DJPSB100018 Plus Short Block Engine | 2003-2004.5 Dodge RAM 2500/3500 5.9L Cummins

D&J Precision

D&J Precision DJPSB100018 Plus Short Block Engine | 2003-2004.5 Dodge RAM 2500/3500 5.9L Cummins

SKU: DNJDJPSB100018
$6,597.99
$6,945.99
SAVE $348
ARP 447-1301 SS 12pt Exhaust Manifold Bolt Kit | 2003-2025 Dodge RAM 2500/3500 5.9/6.7L Cummins No Spacers
ARP 447-1301 SS 12pt Exhaust Manifold Bolt Kit | 2003-2025 Dodge RAM 2500/3500 5.9/6.7L Cummins No Spacers

ARP

ARP 447-1301 SS 12pt Exhaust Manifold Bolt Kit | 2003-2025 Dodge RAM 2500/3500 5.9/6.7L Cummins No Spacers

SKU: ARP447-1301
$195.28
ARP 447-1201 SS 12pt Exhaust Manifold Bolt Kit | 2003-2025 Dodge RAM 2500/3500 5.9/6.7L Cummins No Spacers/Heat Shield
ARP 447-1201 SS 12pt Exhaust Manifold Bolt Kit | 2003-2025 Dodge RAM 2500/3500 5.9/6.7L Cummins No Spacers/Heat Shield

ARP

ARP 447-1201 SS 12pt Exhaust Manifold Bolt Kit | 2003-2025 Dodge RAM 2500/3500 5.9/6.7L Cummins No Spacers/Heat Shield

SKU: ARP447-1201
$77.33
ARP 447-1101 SS Hex Exhaust Manifold Bolt Kit | 2003-2026 Dodge RAM 2500/3500 5.9/6.7L Cummins No Spacers
ARP 447-1101 SS Hex Exhaust Manifold Bolt Kit | 2003-2026 Dodge RAM 2500/3500 5.9/6.7L Cummins No Spacers

ARP

ARP 447-1101 SS Hex Exhaust Manifold Bolt Kit | 2003-2026 Dodge RAM 2500/3500 5.9/6.7L Cummins No Spacers

SKU: ARP447-1101
$74.28
D&J Precision DJPLB100102 Heavy Hauler Ready Run Engine | 2004-2005 Dodge RAM 2500/3500 5.9L Cummins
D&J Precision DJPLB100102 Heavy Hauler Ready Run Engine | 2004-2005 Dodge RAM 2500/3500 5.9L Cummins
D&J Precision DJPLB100102 Heavy Hauler Ready Run Engine | 2004-2005 Dodge RAM 2500/3500 5.9L Cummins
D&J Precision DJPLB100102 Heavy Hauler Ready Run Engine | 2004-2005 Dodge RAM 2500/3500 5.9L Cummins

D&J Precision

D&J Precision DJPLB100102 Heavy Hauler Ready Run Engine | 2004-2005 Dodge RAM 2500/3500 5.9L Cummins

SKU: DNJDJPLB100102
$28,994.99
$30,521.99
SAVE $1,527
Hamilton Cams 07-CC-24V188 24 Valve 188/220 Camshaft Combo | 1998.5-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins
IN STOCK
Hamilton Cams 07-CC-24V188 24 Valve 188/220 Camshaft Combo | 1998.5-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Hamilton Cams 07-CC-24V188 24 Valve 188/220 Camshaft Combo | 1998.5-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Hamilton Cams 07-CC-24V188 24 Valve 188/220 Camshaft Combo | 1998.5-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Hamilton Cams 07-CC-24V188 24 Valve 188/220 Camshaft Combo | 1998.5-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins

Hamilton Cams

Hamilton Cams 07-CC-24V188 24 Valve 188/220 Camshaft Combo | 1998.5-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins

SKU: HAM07-CC-24V188
$1,349
PPE 218034350 Head Stud Kit - High Yield | 1998.5-2024 RAM 2500/3500 5.9L/6.7L Cummins
IN STOCK
PPE 218034350 Head Stud Kit - High Yield | 1998.5-2024 RAM 2500/3500 5.9L/6.7L Cummins
PPE 218034350 Head Stud Kit - High Yield | 1998.5-2024 RAM 2500/3500 5.9L/6.7L Cummins
PPE 218034350 Head Stud Kit - High Yield | 1998.5-2024 RAM 2500/3500 5.9L/6.7L Cummins

PPE

PPE 218034350 Head Stud Kit - High Yield | 1998.5-2024 RAM 2500/3500 5.9L/6.7L Cummins

SKU: PPE218034350
$1,214.99
$1,349.99
SAVE $135
Fleece FPE-CUMM-HCL-KIT-9902 Heater Feed and Return Hose Kit | 1998.5-2002 Dodge RAM 2500/3500 5.9L Cummins VP
IN STOCK
Fleece FPE-CUMM-HCL-KIT-9902 Heater Feed and Return Hose Kit | 1998.5-2002 Dodge RAM 2500/3500 5.9L Cummins VP
Fleece FPE-CUMM-HCL-KIT-9902 Heater Feed and Return Hose Kit | 1998.5-2002 Dodge RAM 2500/3500 5.9L Cummins VP

Fleece Performance Products

Fleece FPE-CUMM-HCL-KIT-9902 Heater Feed and Return Hose Kit | 1998.5-2002 Dodge RAM 2500/3500 5.9L Cummins VP

SKU: FLCFPE-CUMM-HCL-KIT-9902
$79.99
$83.99
SAVE $4
JEEPCABLES JEEDCMN94-59-00G 2nd Gen Battery Cable Kit (Size 2/0 GA) | 1998-2002 Dodge RAM 2500/3500 Cummins Diesel
JEEPCABLES JEEDCMN94-59-00G 2nd Gen Battery Cable Kit (Size 2/0 GA) | 1998-2002 Dodge RAM 2500/3500 Cummins Diesel
JEEPCABLES JEEDCMN94-59-00G 2nd Gen Battery Cable Kit (Size 2/0 GA) | 1998-2002 Dodge RAM 2500/3500 Cummins Diesel
JEEPCABLES JEEDCMN94-59-00G 2nd Gen Battery Cable Kit (Size 2/0 GA) | 1998-2002 Dodge RAM 2500/3500 Cummins Diesel
JEEPCABLES JEEDCMN94-59-00G 2nd Gen Battery Cable Kit (Size 2/0 GA) | 1998-2002 Dodge RAM 2500/3500 Cummins Diesel

JEEPCABLES

JEEPCABLES JEEDCMN94-59-00G 2nd Gen Battery Cable Kit (Size 2/0 GA) | 1998-2002 Dodge RAM 2500/3500 Cummins Diesel

SKU: JEEDCMN94-59-00G
$365.50
JEEPCABLES JEEDCMN94-59-0G 2nd Gen Battery Cable Kit (Size 1/0 GA) | 1998-2002 Dodge RAM 2500/3500 Cummins Diesel
JEEPCABLES JEEDCMN94-59-0G 2nd Gen Battery Cable Kit (Size 1/0 GA) | 1998-2002 Dodge RAM 2500/3500 Cummins Diesel
JEEPCABLES JEEDCMN94-59-0G 2nd Gen Battery Cable Kit (Size 1/0 GA) | 1998-2002 Dodge RAM 2500/3500 Cummins Diesel
JEEPCABLES JEEDCMN94-59-0G 2nd Gen Battery Cable Kit (Size 1/0 GA) | 1998-2002 Dodge RAM 2500/3500 Cummins Diesel
JEEPCABLES JEEDCMN94-59-0G 2nd Gen Battery Cable Kit (Size 1/0 GA) | 1998-2002 Dodge RAM 2500/3500 Cummins Diesel

JEEPCABLES

JEEPCABLES JEEDCMN94-59-0G 2nd Gen Battery Cable Kit (Size 1/0 GA) | 1998-2002 Dodge RAM 2500/3500 Cummins Diesel

SKU: JEEDCMN94-59-0G
$305.50
JEEPCABLES JEEDCMN03-I6-0G 3rd Gen Battery Cable Kit (Size 1/0) | 2002-2005 Dodge RAM 2500/3500 Cummins Diesel
JEEPCABLES JEEDCMN03-I6-0G 3rd Gen Battery Cable Kit (Size 1/0) | 2002-2005 Dodge RAM 2500/3500 Cummins Diesel
JEEPCABLES JEEDCMN03-I6-0G 3rd Gen Battery Cable Kit (Size 1/0) | 2002-2005 Dodge RAM 2500/3500 Cummins Diesel
JEEPCABLES JEEDCMN03-I6-0G 3rd Gen Battery Cable Kit (Size 1/0) | 2002-2005 Dodge RAM 2500/3500 Cummins Diesel
JEEPCABLES JEEDCMN03-I6-0G 3rd Gen Battery Cable Kit (Size 1/0) | 2002-2005 Dodge RAM 2500/3500 Cummins Diesel

JEEPCABLES

JEEPCABLES JEEDCMN03-I6-0G 3rd Gen Battery Cable Kit (Size 1/0) | 2002-2005 Dodge RAM 2500/3500 Cummins Diesel

SKU: JEEDCMN03-I6-0G
$310.50
DFC Diesel TH590304STAUSOALBHD Tow/Haul HD Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins
DFC Diesel TH590304STAUSOALBHD Tow/Haul HD Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins
DFC Diesel TH590304STAUSOALBHD Tow/Haul HD Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins
DFC Diesel TH590304STAUSOALBHD Tow/Haul HD Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins
DFC Diesel TH590304STAUSOALBHD Tow/Haul HD Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins
DFC Diesel TH590304STAUSOALBHD Tow/Haul HD Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins

DFC Diesel

DFC Diesel TH590304STAUSOALBHD Tow/Haul HD Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins

SKU: DDUTH590304STAUSOALBHD
$20,702.67
DFC Diesel TH590304STAUSOALB Tow/Haul Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins
DFC Diesel TH590304STAUSOALB Tow/Haul Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins
DFC Diesel TH590304STAUSOALB Tow/Haul Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins
DFC Diesel TH590304STAUSOALB Tow/Haul Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins
DFC Diesel TH590304STAUSOALB Tow/Haul Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins
DFC Diesel TH590304STAUSOALB Tow/Haul Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins

DFC Diesel

DFC Diesel TH590304STAUSOALB Tow/Haul Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins

SKU: DDUTH590304STAUSOALB
$15,394.77
DFC Diesel SS590304STAUSOALB Street Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins
DFC Diesel SS590304STAUSOALB Street Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins
DFC Diesel SS590304STAUSOALB Street Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins
DFC Diesel SS590304STAUSOALB Street Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins
DFC Diesel SS590304STAUSOALB Street Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins
DFC Diesel SS590304STAUSOALB Street Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins

DFC Diesel

DFC Diesel SS590304STAUSOALB Street Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins

SKU: DDUSS590304STAUSOALB
$11,171.44
BD Diesel DJPCH100027 Stage 1 Performance Cylinder Head w/ Fire Ring | 2003-2007 Dodge RAM 2500-3500 5.9L Cummins
BD Diesel DJPCH100027 Stage 1 Performance Cylinder Head w/ Fire Ring | 2003-2007 Dodge RAM 2500-3500 5.9L Cummins
BD Diesel DJPCH100027 Stage 1 Performance Cylinder Head w/ Fire Ring | 2003-2007 Dodge RAM 2500-3500 5.9L Cummins

BD Diesel

BD Diesel DJPCH100027 Stage 1 Performance Cylinder Head w/ Fire Ring | 2003-2007 Dodge RAM 2500-3500 5.9L Cummins

SKU: BDDDJPCH100027
$3,464.99
BD Diesel DJPCH100026 Stage 1 Performance Cylinder Head - with out Fire Ring | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
BD Diesel DJPCH100026 Stage 1 Performance Cylinder Head - with out Fire Ring | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
BD Diesel DJPCH100026 Stage 1 Performance Cylinder Head - with out Fire Ring | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

BD Diesel

BD Diesel DJPCH100026 Stage 1 Performance Cylinder Head - with out Fire Ring | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

SKU: BDDDJPCH100026
$3,149.99
BD Diesel DJPCH100008 Reman Cylinder Head | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
BD Diesel DJPCH100008 Reman Cylinder Head | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
BD Diesel DJPCH100008 Reman Cylinder Head | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

BD Diesel

BD Diesel DJPCH100008 Reman Cylinder Head | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

SKU: BDDDJPCH100008
$2,204.99
AFE 46-50064-B BladeRunner Silicone Radiator Hose Kit | 2003-2009 Dodge RAM 5.9L / 6.7L Cummins
IN STOCK
AFE 46-50064-B BladeRunner Silicone Radiator Hose Kit | 2003-2009 Dodge RAM 5.9L / 6.7L Cummins
AFE 46-50064-B BladeRunner Silicone Radiator Hose Kit | 2003-2009 Dodge RAM 5.9L / 6.7L Cummins

AFE Power

AFE 46-50064-B BladeRunner Silicone Radiator Hose Kit | 2003-2009 Dodge RAM 5.9L / 6.7L Cummins

SKU: AFE46-50064-B
$192
Mishimoto MMOC-RAM-03 Replacement Oil Cooler | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
IN STOCK
Mishimoto MMOC-RAM-03 Replacement Oil Cooler | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
Mishimoto MMOC-RAM-03 Replacement Oil Cooler | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

Mishimoto

Mishimoto MMOC-RAM-03 Replacement Oil Cooler | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

SKU: MIMMMOC-RAM-03
$299.95
$330
SAVE $30.05
Sinister SD-COOLFIL-5.9-03-W Coolant Filtration System | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
Sinister SD-COOLFIL-5.9-03-W Coolant Filtration System | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

Sinister Diesel

Sinister SD-COOLFIL-5.9-03-W Coolant Filtration System | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

SKU: SINSD-COOLFIL-5.9-03-W
$219.99
S&B 66-2247 Stock Replacement Oiled Filter | 2002-2007 Dodge RAM 1500/2500
IN STOCK
S&B 66-2247 Stock Replacement Oiled Filter | 2002-2007 Dodge RAM 1500/2500

S&B Filters

S&B 66-2247 Stock Replacement Oiled Filter | 2002-2007 Dodge RAM 1500/2500

SKU: SAB66-2247
$39.32
Mishimoto MMHOSE-RAM-03DRD Silicone Coolant Hose Kit | 2003-2010 Dodge RAM Cummins
IN STOCK
Mishimoto MMHOSE-RAM-03DRD Silicone Coolant Hose Kit | 2003-2010 Dodge RAM Cummins

Mishimoto

Mishimoto MMHOSE-RAM-03DRD Silicone Coolant Hose Kit | 2003-2010 Dodge RAM Cummins

SKU: MIMMMHOSE-RAM-03DRD
$199.95
$220
SAVE $20.05

FREE SHIPPING ON ALL
ORDERS OVER $70

PRICE MATCH GUARANTEE

BUILD NOW, PAY LATER
FINANCING OPTIONS

30-DAY RETURN SATISFACTION GUARANTEE

DIESEL TRUCK EXPERTS STANDING BY

If you're looking to turn your 5.9L Cummins into a beast that can handle anything thrown its way, check out our Engine & Performance upgrades!  When it comes to every aspect of performance, from cooling upgrades to free flow pipes and intakes, we've got your truck covered. From tuners & modules, oil pans, valve covers, and even high-performance crate engines, Alligator Performance is sure to have what you need in order to upgrade your Ram 5.9L Cummins. Whether you're looking to add more power, reliability or durability, we have you covered at Alligator Performance. Pair your new engine upgrades with our selection of top tier Turbo Upgrades! Ram Cummins Fitments: 2003, 2004 Ram 5.9L Cummins. Submodel Fitments: Tradesman, Laramie, Laramie Longhorn, Big Horn, Limited, Lone Star, Power Wagon. Some exceptions apply, please see individual product pages for specific fitments.

Tuners & Modules
Cooling Upgrades
Head Studs & Main Studs
Oil Pans, Valve Covers & Accessories
Crate Engines & Engine Rebuild Kits

Can We Help You Find Something?

Give us a call: +1-208-719-7400

Chat With Us