The Stage 2 48RE transmission is the most popular build for the 03-07 5.9 Cummins trucks; rated for up to 650 horsepower. This transmission is built with heavy-duty components, including a billet input shaft, upgraded clutches and bands, and a modified valve body, making it more durable and reliable. To help harness the power your truck makes, we couple the transmission with is our in-house built triple disc converter, which provides increased lockup, resulting in better acceleration and pulling power.