2003-2004 Ram 2500/3500 5.9L Cummins Transmission Upgrades

We offer an excellent selection of complete transmission swaps to module kits for the 2003-2004 Ram 5.9L Cummins powered trucks, we here offer a wide range of transmission upgrades to suit your replacement/repair needs. Having a smooth operating transmission is paramount to optimal performance and longevity, which is why we have all of your bases covered with transmission pans with additional fluid capacity and increased cooling performance, torque convertors, flex plates, and much more. Whether you're experiencing slipping gears or need to upgrade your transmission to keep up with your high-performance engine, find your transmission upgrade solution here at Alligator Performance. Pair your transmission upgrades with our selection of Engine 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.