2003-2004 Ram 5.9L Cummins Complete Transmissions

Whether your Ram's transmission has seen better days or if you're looking to add some serious horsepower and torque to your Ram truck build, a Tier One performance transmission may be your best bet. Tier One's built transmissions for 2003-2004 Ram 5.9L Cummins 2500 and 3500 trucks can handle enormous levels of horsepower and torque, all while giving your Cummins Ram improved reliability in tough applications like heavy towing, aggressive street driving, tough off-roading, hard drag racing, and high-powered dyno runs. Tier One has several different built 48RE transmission configurations to choose from so that you can find the perfect Dodge Ram performance transmission for your power level or given application. Each of these 5.9L Cummins transmissions are 100% complete and drop right into place of your Ram's factory transmission. Even the best transmission build needs a reliable connection to the engine, so if you are piecing together your own build or need a specific stall speed, look at our 2003-2004 Ram 5.9L Cummins Torque Converters. You've invested in a high-performance transmission, now you need to protect it from heat while towing by adding one of our 2003-2004 Ram 5.9L Cummins Transmission Coolers. If you aren't ready for a complete transmission swap but want to fix shifting issues and increase line pressure, a standalone valve body upgrade is a great middle-ground, so check out our 2003-2004 Ram 5.9L Cummins Valve Bodies. From deep pans that increase oil capacity to billet shafts for custom rebuilds, we have the individual components to finish your project in our 2003-2004 Ram 5.9L Cummins Transmission Parts.