2004.5-2007 Ram 5.9L Cummins Complete Transmissions

The 5.9L Cummins under the hood of your 2004.5-2007 Ram 2500 or 3500 can make a whole ton of extra horsepower and torque with even a few simple mods and tuning, but your stock 48RE transmission is going to struggle to handle it all. Tier One's built transmissions for 2004.5-2007 Ram 5.9L 2500 and 3500 trucks are designed from the ground up to hold more power than stock, while also giving you the reliability you need to rip around the street, tow extremely heavy loads, conquer off-road trails, or tear down the drag strip. We here at Tier One offer complete Ram 5.9L Cummins transmissions in several different power levels and configurations so that you can find the perfect transmission for your Ram's horsepower output, application, or budget. 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 2004.5-2007 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 2004.5-2007 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 2004.5-2007 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 2004.5-2007 Ram 5.9L Cummins Transmission Parts.