TransGo

While the combination of Duramax motor and Allison transmission in your GM 2500 or 3500 truck may be a potent combo, the Allison's aren't without their flaws. The good news is that TransGo is here with both shift kits and boost valves to help you and your truck out. The Allison transmission can suffer from high line pressures and early converter clutch engagement that hurts its reliability, especially when your Duramax is churning out big-time horsepower and torque. TransGo's shift kits and boost valves are built from the ground up for durability and reliability so that they don't let your Duramax build down when you need it most.