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
195 products
Sort by:
Best selling
Mahle S42170 Piston Ring Set | 2004.5-2007 Dodge RAM 2500/3500 5.9L Cummins
IN STOCK
Mahle S42170 Piston Ring Set | 2004.5-2007 Dodge RAM 2500/3500 5.9L Cummins

Mahle

Mahle S42170 Piston Ring Set | 2004.5-2007 Dodge RAM 2500/3500 5.9L Cummins

SKU: MCIS42170
$39.36
Fleece FPE-34657-AL Billet Aluminum Upper Fan Pulley Idler | 2003-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Fleece FPE-34657-AL Billet Aluminum Upper Fan Pulley Idler | 2003-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Fleece FPE-34657-AL Billet Aluminum Upper Fan Pulley Idler | 2003-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins

Fleece Performance Products

Fleece FPE-34657-AL Billet Aluminum Upper Fan Pulley Idler | 2003-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins

SKU: FLCFPE-34657-AL
$85.49
Industrial PDM-3672CC Standard Coated & Chamfered Piston Kit w/ Rings | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins
Industrial PDM-3672CC Standard Coated & Chamfered Piston Kit w/ Rings | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins
Industrial PDM-3672CC Standard Coated & Chamfered Piston Kit w/ Rings | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins

Industrial Injection

Industrial PDM-3672CC Standard Coated & Chamfered Piston Kit w/ Rings | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins

SKU: IISPDM-3672CC
$1,934.13
$2,200
H&S Motorsports 453003 Extended Upper Radiator Hose | 03-07 Dodge RAM 2500/3500 5.9L Cummins
H&S Motorsports 453003 Extended Upper Radiator Hose | 03-07 Dodge RAM 2500/3500 5.9L Cummins

H&S Motorsports

H&S Motorsports 453003 Extended Upper Radiator Hose | 03-07 Dodge RAM 2500/3500 5.9L Cummins

SKU: HSM453003
$159
Fleece FPE-OC-CR-F-RED Cummins Billet Oil Cap Cover Red | 2003-2018 Dodge RAM 5.9L/6.7LCummins
IN STOCK
Fleece FPE-OC-CR-F-RED Cummins Billet Oil Cap Cover Red | 2003-2018 Dodge RAM 5.9L/6.7LCummins
Fleece FPE-OC-CR-F-RED Cummins Billet Oil Cap Cover Red | 2003-2018 Dodge RAM 5.9L/6.7LCummins

Fleece Performance Products

Fleece FPE-OC-CR-F-RED Cummins Billet Oil Cap Cover Red | 2003-2018 Dodge RAM 5.9L/6.7LCummins

SKU: FLCFPE-OC-CR-F-RED
$34.99
Mahle 54556A Victor Reinz 1.20mm Thick Head Gasket | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
Mahle 54556A Victor Reinz 1.20mm Thick Head Gasket | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

Victor Reinz

Mahle 54556A Victor Reinz 1.20mm Thick Head Gasket | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

SKU: MCI54556A
$416.93
DFC Diesel KORE590304STAUSOALB Kore Series Speed of Air Long Block (STD/AUTO) | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins
DFC Diesel KORE590304STAUSOALB Kore Series Speed of Air Long Block (STD/AUTO) | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins
DFC Diesel KORE590304STAUSOALB Kore Series Speed of Air Long Block (STD/AUTO) | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins

DFC Diesel

DFC Diesel KORE590304STAUSOALB Kore Series Speed of Air Long Block (STD/AUTO) | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins

SKU: DDUKORE590304STAUSOALB
$8,049
DFC Diesel KORE590304STAULB Kore Series Long Block (STD/AUTO) | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins
DFC Diesel KORE590304STAULB Kore Series Long Block (STD/AUTO) | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins
DFC Diesel KORE590304STAULB Kore Series Long Block (STD/AUTO) | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins

DFC Diesel

DFC Diesel KORE590304STAULB Kore Series Long Block (STD/AUTO) | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins

SKU: DDUKORE590304STAULB
$4,949
DFC Diesel KORE590002SOALB Kore Series Speed of Air Long Block (STD/AUTO) | 2000-2002 Dodge RAM 2500/3500 5.9L Cummins 24V
DFC Diesel KORE590002SOALB Kore Series Speed of Air Long Block (STD/AUTO) | 2000-2002 Dodge RAM 2500/3500 5.9L Cummins 24V
DFC Diesel KORE590002SOALB Kore Series Speed of Air Long Block (STD/AUTO) | 2000-2002 Dodge RAM 2500/3500 5.9L Cummins 24V

DFC Diesel

DFC Diesel KORE590002SOALB Kore Series Speed of Air Long Block (STD/AUTO) | 2000-2002 Dodge RAM 2500/3500 5.9L Cummins 24V

SKU: DDUKORE590002SOALB
$8,049
DFC Diesel KORE590002LB Kore Series Long Block (STD/AUTO) | 2000-2002 Dodge RAM 2500/3500 5.9L Cummins 24V
DFC Diesel KORE590002LB Kore Series Long Block (STD/AUTO) | 2000-2002 Dodge RAM 2500/3500 5.9L Cummins 24V
DFC Diesel KORE590002LB Kore Series Long Block (STD/AUTO) | 2000-2002 Dodge RAM 2500/3500 5.9L Cummins 24V

DFC Diesel

DFC Diesel KORE590002LB Kore Series Long Block (STD/AUTO) | 2000-2002 Dodge RAM 2500/3500 5.9L Cummins 24V

SKU: DDUKORE590002LB
$4,949
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
Industrial 244122 Coated & Chamfered ISB X-Series Piston Kit (.040) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244122 Coated & Chamfered ISB X-Series Piston Kit (.040) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244122 Coated & Chamfered ISB X-Series Piston Kit (.040) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

Industrial Injection

Industrial 244122 Coated & Chamfered ISB X-Series Piston Kit (.040) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

SKU: IIS244122
$1,648.95
$1,699.95
Industrial 244121 Fly Cut Coated & Chamfered ISB X-Series Piston Kit (.020) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244121 Fly Cut Coated & Chamfered ISB X-Series Piston Kit (.020) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244121 Fly Cut Coated & Chamfered ISB X-Series Piston Kit (.020) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

Industrial Injection

Industrial 244121 Fly Cut Coated & Chamfered ISB X-Series Piston Kit (.020) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

SKU: IIS244121
$1,648.95
$1,699.95
Industrial 244120 Fly Cut Coated & Chamfered ISB X-Series Piston Kit (Standard) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244120 Fly Cut Coated & Chamfered ISB X-Series Piston Kit (Standard) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244120 Fly Cut Coated & Chamfered ISB X-Series Piston Kit (Standard) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

Industrial Injection

Industrial 244120 Fly Cut Coated & Chamfered ISB X-Series Piston Kit (Standard) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

SKU: IIS244120
$1,648.95
$1,699.95
Industrial 244117 Coated & Chamfered ISB X-Series Piston Kit (.040) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244117 Coated & Chamfered ISB X-Series Piston Kit (.040) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244117 Coated & Chamfered ISB X-Series Piston Kit (.040) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

Industrial Injection

Industrial 244117 Coated & Chamfered ISB X-Series Piston Kit (.040) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

SKU: IIS244117
$1,551.95
$1,599.95
Industrial 244116 Coated & Chamfered ISB X-Series Piston Kit (.020) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244116 Coated & Chamfered ISB X-Series Piston Kit (.020) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244116 Coated & Chamfered ISB X-Series Piston Kit (.020) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

Industrial Injection

Industrial 244116 Coated & Chamfered ISB X-Series Piston Kit (.020) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

SKU: IIS244116
$1,551.95
$1,599.95
Industrial 244115 Coated & Chamfered ISB X-Series Piston Kit (Standard) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244115 Coated & Chamfered ISB X-Series Piston Kit (Standard) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244115 Coated & Chamfered ISB X-Series Piston Kit (Standard) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

Industrial Injection

Industrial 244115 Coated & Chamfered ISB X-Series Piston Kit (Standard) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

SKU: IIS244115
$1,551.95
$1,599.95
Industrial 244112 ISB X-Series Piston Kit (.040) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244112 ISB X-Series Piston Kit (.040) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244112 ISB X-Series Piston Kit (.040) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

Industrial Injection

Industrial 244112 ISB X-Series Piston Kit (.040) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

SKU: IIS244112
$1,260.95
$1,299.95
Industrial 244111 ISB X-Series Piston Kit (.020) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244111 ISB X-Series Piston Kit (.020) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V
Industrial 244111 ISB X-Series Piston Kit (.020) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

Industrial Injection

Industrial 244111 ISB X-Series Piston Kit (.020) | 2003-2004 Dodge RAM 2500/3500 4WD 5.9L Cummins 24V

SKU: IIS244111
$1,260.95
$1,299.95
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
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
$5,669.99
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
$6,404.99
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

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