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

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Mahle CB1873H H-Series Rod Bearing | 2003-2017 Dodge RAM 2500/3500 Cummins
Mahle CB1873H H-Series Rod Bearing | 2003-2017 Dodge RAM 2500/3500 Cummins

Mahle

Mahle CB1873H H-Series Rod Bearing | 2003-2017 Dodge RAM 2500/3500 Cummins

SKU: MCICB1873H
$22.68
EFI Live LIC-FS2-VIN Tuning FlashScan V2 VIN License | Universal
EFI Live LIC-FS2-VIN Tuning FlashScan V2 VIN License | Universal
EFI Live LIC-FS2-VIN Tuning FlashScan V2 VIN License | Universal

EFI Live

EFI Live LIC-FS2-VIN Tuning FlashScan V2 VIN License | Universal

SKU: EFILIC-FS2-VIN
$125
$129.99
SAVE $4.99
Fleece FPE-61-10005-HD Freedom Series Cylinder Head (Street HD) | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
IN STOCK
Fleece FPE-61-10005-HD Freedom Series Cylinder Head (Street HD) | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
Fleece FPE-61-10005-HD Freedom Series Cylinder Head (Street HD) | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
Fleece FPE-61-10005-HD Freedom Series Cylinder Head (Street HD) | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

Fleece Performance Products

Fleece FPE-61-10005-HD Freedom Series Cylinder Head (Street HD) | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

SKU: FLCFPE-61-10005-HD
$2,599
$2,699
SAVE $100
Fleece FPE-CLNTBYPS-CUMMINS-SER-Kit Coolant Bypass Service Kit | 1994-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Fleece FPE-CLNTBYPS-CUMMINS-SER-Kit Coolant Bypass Service Kit | 1994-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Fleece FPE-CLNTBYPS-CUMMINS-SER-Kit Coolant Bypass Service Kit | 1994-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins

Fleece Performance Products

Fleece FPE-CLNTBYPS-CUMMINS-SER-Kit Coolant Bypass Service Kit | 1994-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins

SKU: FLCFPE-CLNTBYPS-CUMMINS-SER-KIT
$27.99
Fleece FPE-34660-AL Fan Drive Pulley Bare Aluminum Finish | 2003-2012 Dodge RAM 5.9L/6.7L 2500/3500 Cummins
IN STOCK
Fleece FPE-34660-AL Fan Drive Pulley Bare Aluminum Finish | 2003-2012 Dodge RAM 5.9L/6.7L 2500/3500 Cummins
Fleece FPE-34660-AL Fan Drive Pulley Bare Aluminum Finish | 2003-2012 Dodge RAM 5.9L/6.7L 2500/3500 Cummins
Fleece FPE-34660-AL Fan Drive Pulley Bare Aluminum Finish | 2003-2012 Dodge RAM 5.9L/6.7L 2500/3500 Cummins

Fleece Performance Products

Fleece FPE-34660-AL Fan Drive Pulley Bare Aluminum Finish | 2003-2012 Dodge RAM 5.9L/6.7L 2500/3500 Cummins

SKU: FLCFPE-34660-AL
$85.49
DuramaxTuner DT1202040101000 Smarty UDC Tuning incl MM3 Hardware | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
DuramaxTuner DT1202040101000 Smarty UDC Tuning incl MM3 Hardware | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
DuramaxTuner DT1202040101000 Smarty UDC Tuning incl MM3 Hardware | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

Duramax Tuner

DuramaxTuner DT1202040101000 Smarty UDC Tuning incl MM3 Hardware | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

SKU: DMTDT1202040101000
$1,230
Edge 85401-301 Evolution CTS3 | 2003-2012 Dodge RAM 2500/3500 5.9L/6.7L Cummins
IN STOCK
Edge 85401-301 Evolution CTS3 | 2003-2012 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Edge 85401-301 Evolution CTS3 | 2003-2012 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Edge 85401-301 Evolution CTS3 | 2003-2012 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Edge 85401-301 Evolution CTS3 | 2003-2012 Dodge RAM 2500/3500 5.9L/6.7L Cummins

Edge Products

Edge 85401-301 Evolution CTS3 | 2003-2012 Dodge RAM 2500/3500 5.9L/6.7L Cummins

SKU: EDG85401-301
$849.95
$956.95
SAVE $107
S&B 83-1013 Heater Core Supply Hose | 2003-2024 Dodge RAM 2500/3500 5.9L & 6.7L Cummins
IN STOCK
S&B 83-1013 Heater Core Supply Hose | 2003-2024 Dodge RAM 2500/3500 5.9L & 6.7L Cummins
S&B 83-1013 Heater Core Supply Hose | 2003-2024 Dodge RAM 2500/3500 5.9L & 6.7L Cummins
S&B 83-1013 Heater Core Supply Hose | 2003-2024 Dodge RAM 2500/3500 5.9L & 6.7L Cummins
S&B 83-1013 Heater Core Supply Hose | 2003-2024 Dodge RAM 2500/3500 5.9L & 6.7L Cummins

S&B Filters

S&B 83-1013 Heater Core Supply Hose | 2003-2024 Dodge RAM 2500/3500 5.9L & 6.7L Cummins

SKU: SAB83-1013
$69
Wagler CRD5.9/6.7ST Street Fighter Connecting Rods | 1989-2018 Dodge RAM 2500/3500
IN STOCK
Wagler CRD5.9/6.7ST Street Fighter Connecting Rods | 1989-2018 Dodge RAM 2500/3500
Wagler CRD5.9/6.7ST Street Fighter Connecting Rods | 1989-2018 Dodge RAM 2500/3500

Wagler Competition Products

Wagler CRD5.9/6.7ST Street Fighter Connecting Rods | 1989-2018 Dodge RAM 2500/3500

SKU: WCPCRD5.9/6.7ST
$2,284.56
Industrial PDM-08207 Freeze Plug Back Plate Plug W/ O Ring | 2003-2018 Dodge RAM 2500/3500 5.9/6.7 Cummins
IN STOCK
Industrial PDM-08207 Freeze Plug Back Plate Plug W/ O Ring | 2003-2018 Dodge RAM 2500/3500 5.9/6.7 Cummins
Industrial PDM-08207 Freeze Plug Back Plate Plug W/ O Ring | 2003-2018 Dodge RAM 2500/3500 5.9/6.7 Cummins
Industrial PDM-08207 Freeze Plug Back Plate Plug W/ O Ring | 2003-2018 Dodge RAM 2500/3500 5.9/6.7 Cummins
Industrial PDM-08207 Freeze Plug Back Plate Plug W/ O Ring | 2003-2018 Dodge RAM 2500/3500 5.9/6.7 Cummins
Industrial PDM-08207 Freeze Plug Back Plate Plug W/ O Ring | 2003-2018 Dodge RAM 2500/3500 5.9/6.7 Cummins

Industrial Injection

Industrial PDM-08207 Freeze Plug Back Plate Plug W/ O Ring | 2003-2018 Dodge RAM 2500/3500 5.9/6.7 Cummins

SKU: IISPDM-08207
$67.85
$69.95
SAVE $2.10
Hamilton Cams 07-R-003 24V High Performance OEM-Style Rocker Arms | 1998.5–2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins
IN STOCK
Hamilton Cams 07-R-003 24V High Performance OEM-Style Rocker Arms | 1998.5–2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Hamilton Cams 07-R-003 24V High Performance OEM-Style Rocker Arms | 1998.5–2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Hamilton Cams 07-R-003 24V High Performance OEM-Style Rocker Arms | 1998.5–2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins

Hamilton Cams

Hamilton Cams 07-R-003 24V High Performance OEM-Style Rocker Arms | 1998.5–2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins

SKU: HAM07-R-003
$889
$899
SAVE $10
Fleece FPE-CUMM-LHCL-0312 Lower Heater Return Hose | 2003-2012 Dodge Ram 2500/3500 5.9L/6.7L Cummins
IN STOCK
Fleece FPE-CUMM-LHCL-0312 Lower Heater Return Hose | 2003-2012 Dodge Ram 2500/3500 5.9L/6.7L Cummins
Fleece FPE-CUMM-LHCL-0312 Lower Heater Return Hose | 2003-2012 Dodge Ram 2500/3500 5.9L/6.7L Cummins

Fleece Performance Products

Fleece FPE-CUMM-LHCL-0312 Lower Heater Return Hose | 2003-2012 Dodge Ram 2500/3500 5.9L/6.7L Cummins

SKU: FLCFPE-CUMM-LHCL-0312
$39.99
$41.99
SAVE $2
Industrial Injection IIS237603 Pressure Relief Valve Block Off | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
IN STOCK
Industrial Injection IIS237603 Pressure Relief Valve Block Off | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

Industrial Injection

Industrial Injection IIS237603 Pressure Relief Valve Block Off | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

SKU: IIS237603
$39.72
$53
SAVE $13.28
Mishimoto MMHOSE-RAM-03DBL Blue Silicone Coolant Hose Kit | 2003-2010 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Mishimoto MMHOSE-RAM-03DBL Blue Silicone Coolant Hose Kit | 2003-2010 Dodge RAM 2500/3500 5.9L/6.7L Cummins

Mishimoto

Mishimoto MMHOSE-RAM-03DBL Blue Silicone Coolant Hose Kit | 2003-2010 Dodge RAM 2500/3500 5.9L/6.7L Cummins

SKU: MIMMMHOSE-RAM-03DBL
$199.95
$220
SAVE $20.05
PPE 518001000 Weld-On Billet Radiator Neck | Universal
IN STOCK
PPE 518001000 Weld-On Billet Radiator Neck | Universal
PPE 518001000 Weld-On Billet Radiator Neck | Universal

PPE

PPE 518001000 Weld-On Billet Radiator Neck | Universal

SKU: PPE518001000
$22.49
Mahle MS2328P P-Series Main Bearing Replacement Set | 1989-2017 Dodge RAM 5.9L/6.7L 2500/3500 Cummins
IN STOCK
Mahle MS2328P P-Series Main Bearing Replacement Set | 1989-2017 Dodge RAM 5.9L/6.7L 2500/3500 Cummins

Mahle

Mahle MS2328P P-Series Main Bearing Replacement Set | 1989-2017 Dodge RAM 5.9L/6.7L 2500/3500 Cummins

SKU: MCIMS2328P
$89.01
Mishimoto MMOC-F HD Transmission Cooler with Fan | Universal
IN STOCK
Mishimoto MMOC-F HD Transmission Cooler with Fan | Universal
Mishimoto MMOC-F HD Transmission Cooler with Fan | Universal
Mishimoto MMOC-F HD Transmission Cooler with Fan | Universal
Mishimoto MMOC-F HD Transmission Cooler with Fan | Universal

Mishimoto

Mishimoto MMOC-F HD Transmission Cooler with Fan | Universal

SKU: MIMMMOC-F
$199.95
$209.95
SAVE $10
Industrial PDM-06023 14mm Gorilla Girdle with ARP Main Studs Package | 2003-2022 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Industrial PDM-06023 14mm Gorilla Girdle with ARP Main Studs Package | 2003-2022 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Industrial PDM-06023 14mm Gorilla Girdle with ARP Main Studs Package | 2003-2022 Dodge RAM 2500/3500 5.9L/6.7L Cummins

Industrial Injection

Industrial PDM-06023 14mm Gorilla Girdle with ARP Main Studs Package | 2003-2022 Dodge RAM 2500/3500 5.9L/6.7L Cummins

SKU: IISPDM-06023
$1,321.09
Edge 98005 CTS2 Pod Adapter | Universal
IN STOCK
Edge 98005 CTS2 Pod Adapter | Universal
Edge 98005 CTS2 Pod Adapter | Universal

Edge Products

Edge 98005 CTS2 Pod Adapter | Universal

SKU: EDG98005
$30.78
$34.63
SAVE $3.85
Edge 98616 EAS Control Kit | Universal
IN STOCK
Edge 98616 EAS Control Kit | Universal
Edge 98616 EAS Control Kit | Universal

Edge Products

Edge 98616 EAS Control Kit | Universal

SKU: EDG98616
$449.95
$506.95
SAVE $57
Edge 98602 EAS Starter Cable for CS2/CTS2/CTS3 | Universal
IN STOCK
Edge 98602 EAS Starter Cable for CS2/CTS2/CTS3 | Universal
Edge 98602 EAS Starter Cable for CS2/CTS2/CTS3 | Universal

Edge Products

Edge 98602 EAS Starter Cable for CS2/CTS2/CTS3 | Universal

SKU: EDG98602
$77.89
$87.95
SAVE $10.06
Carrillo DH7103 High-Performance Piston Set | 1989-2007 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Carrillo DH7103 High-Performance Piston Set | 1989-2007 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Carrillo DH7103 High-Performance Piston Set | 1989-2007 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Carrillo DH7103 High-Performance Piston Set | 1989-2007 Dodge RAM 2500/3500 5.9L/6.7L Cummins

Carrillo

Carrillo DH7103 High-Performance Piston Set | 1989-2007 Dodge RAM 2500/3500 5.9L/6.7L Cummins

SKU: CRLDH7103SET
$2,463.30
$2,605.50
SAVE $142.20
Edge 98607 0-100 PSIG EAS Pressure Sensor | Universal
IN STOCK
Edge 98607 0-100 PSIG EAS Pressure Sensor | Universal

Edge Products

Edge 98607 0-100 PSIG EAS Pressure Sensor | Universal

SKU: EDG98607
$220.95
$248.95
SAVE $28
Fleece FPE-CUMM-CYLHD-KIT Cylinder Head Dowels | 1989-2023 Dodge RAM 2500/3500 5.9L/6.7L Cummins
IN STOCK
Fleece FPE-CUMM-CYLHD-KIT Cylinder Head Dowels | 1989-2023 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Fleece FPE-CUMM-CYLHD-KIT Cylinder Head Dowels | 1989-2023 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Fleece FPE-CUMM-CYLHD-KIT Cylinder Head Dowels | 1989-2023 Dodge RAM 2500/3500 5.9L/6.7L Cummins

Fleece Performance Products

Fleece FPE-CUMM-CYLHD-KIT Cylinder Head Dowels | 1989-2023 Dodge RAM 2500/3500 5.9L/6.7L Cummins

SKU: FLCFPE-CUMM-CYLHD-KIT
$20.99

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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

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