BD's exchange valve bodies are modified, tuned and tested to provide optimum performance in towing and performance applications. These units feature increase line pressure, revised manual valve design, and a custom BD separator plate. The end result is improved shift quality, increased clutch holding capacity, and extended transmission life. What's more, BD's Dodge valve bodies allow for first and second gear lock-up, a great feature for slowing heavy loads down steep grades (AutoLoc/TorqLoc required). Add longevity and performance to your transmission, while making your truck fun to drive.