A lot has happened in 20 years. Myspace has come and gone, Garth Brooks went back to country music, and the transmission in your 2003-2007 Cummins has seen enough miles for a couple trips to the moon and back. The transmission is tired, just like you. The factory 48RE was really only designed to handle the load of factory power, and not much more than that. If it's converted from a gearbox to a forbidden slushy mix, or you're just looking to handle factory level work with some insurance that your draintrain won't lay down on you during your regular day to day, BD Diesel has a cost effective replacement solution for you, to keep costs down for those looking for a straight forward transmission swap. Get the benefits of cleaner shifts, lower RPM response from the enhanced torque converter, better heat management and better stall for street/towing applications.

BD's Roadmaster fully remanufactured transmission features a BD Valve Body that has many modifications to improve shift quality and extend transmission life. The valve body is equipped with a new heavy-duty governor pressure solenoid as well as an upgraded pressure transducer kit with twice the burst pressure as stock. The RoadMaster transmission also includes a deep sump oil pan for increased fluid capacity and cooling. Every 48RE RoadMaster transmission comes packaged with a BD ProForce Torque Converter, and they're dyno tested to ensure you're getting a road ready and reliable replacement.