Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit Engine Components~Lifters 2003 GMC Sierra 1500 SLT

2003 GMC Sierra 1500 SLT

The included ball valves allow you to stop coolant flow to minimize coolant loss during filter changes

Includes a 3-1/2 inch constant-diameter Boost Tube to flow air from the intercooler without restriction

High-Pressure and Low-Pressure

Air Filter (Cotton Cleanable) For Intake Kits: 75-5081

Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit Engine Components~Lifters 2003 GMC Sierra 1500 SLTThe Allison transmission is the backbone of your L5P Duramax. It's responsible for transmitting large quantities of torque from your V8 diesel powerplant. This torque generates a lot of heat, and if that heat isn't dissipated, it can destroy your transmission. The transmission cooler does a good job of keeping trans fluid temperatures in check, but only if the fluid can reach it. The stock cooling system of the Allison 1000 transmission utilizes an in