Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit MMTC-L5P-TBVFF

The 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-line thermal bypass valve that controls fluid flow to the transmission cooler. The purpose of this valve is to prevent transmission fluid from flowing to the cooler until it reaches operating temperature. The thermostat inside this valve is prone to failure, however, and when that happens, the fluid never flows to the cooler, and the transmission can overheat. That's why Mishimoto has developed a full-flow thermal bypass valve upgrade for your 2017+ Chevrolet/GMC 6.6L Duramax. Our CNC-machined aluminum full-flow thermal bypass valve not only looks better than the stock unit, but it performs better too. This Mishimoto thermal bypass valve eliminates the internal thermostat, providing full fluid flow to the transmission cooler in all running conditions. This setup is ideal for owners in warm climates, those performing heavy towing, and trucks needing the best possible cooling efficiency for their transmission. The Mishimoto thermal bypass valve features strategically machined internal passages, providing improved flow over the stock valve for more effective cooling. In addition, cooling fins machined into the valve body add even more heat dissipation. This 2017+ Chevrolet/GMC 6.6L Duramax L5P Full-Flow Thermal Bypass Valve Kit is built to last a lifetime with a durable black anodized finish and our Mishimoto Lifetime Warranty. Fitment: 2017 Chevrolet Silverado 2500 HD High Country 2017 Chevrolet Silverado 2500 HD LT 2017 Chevrolet Silverado 2500 HD LTZ 2017 Chevrolet Silverado 2500 HD WT 2017 Chevrolet Silverado 3500 HD High Country 2017 Chevrolet Silverado 3500 HD LT 2017 Chevrolet Silverado 3500 HD LTZ 2017 Chevrolet Silverado 3500 HD WT 2017 GMC Sierra 2500 HD Base 2017 GMC Sierra 2500 HD Denali 2017 GMC Sierra 2500 HD SLE 2017 GMC Sierra 2500 HD SLT 2017 GMC Sierra 3500 HD Base 2017 GMC Sierra 3500 HD Denali 2017 GMC Sierra 3500 HD SLE 2017 GMC Sierra 3500 HD SLT 2018 Chevrolet Silverado 2500 HD High Country 2018 Chevrolet Silverado 2500 HD LT 2018 Chevrolet Silverado 2500 HD LTZ 2018 Chevrolet Silverado 2500 HD WT 2018 Chevrolet Silverado 3500 HD High Country 2018 Chevrolet Silverado 3500 HD LT 2018 Chevrolet Silverado 3500 HD LTZ 2018 Chevrolet Silverado 3500 HD WT 2018 GMC Sierra 2500 HD Base 2018 GMC Sierra 2500 HD Denali 2018 GMC Sierra 2500 HD SLE 2018 GMC Sierra 2500 HD SLT 2018 GMC Sierra 3500 HD Base 2018 GMC Sierra 3500 HD Denali 2018 GMC Sierra 3500 HD SLE 2018 GMC Sierra 3500 HD SLT 2019 Chevrolet Silverado 2500 HD High Country 2019 Chevrolet Silverado 2500 HD LT 2019 Chevrolet Silverado 2500 HD LTZ 2019 Chevrolet Silverado 2500 HD WT 2019 Chevrolet Silverado 3500 HD High Country 2019 Chevrolet Silverado 3500 HD LT 2019 Chevrolet Silverado 3500 HD LTZ 2019 Chevrolet Silverado 3500 HD WT 2019 GMC Sierra 2500 HD Base 2019 GMC Sierra 2500 HD Denali 2019 GMC Sierra 2500 HD SLE 2019 GMC Sierra 2500 HD SLT 2019 GMC Sierra 3500 HD Base 2019 GMC Sierra 3500 HD Denali 2019 GMC Sierra 3500 HD SLE 2019 GMC Sierra 3500 HD SLT 2020 Chevrolet Silverado 2500 HD High Country 2020 Chevrolet Silverado 2500 HD LT 2020 Chevrolet Silverado 2500 HD LTZ 2020 Chevrolet Silverado 2500 HD WT 2020 Chevrolet Silverado 3500 HD High Country 2020 Chevrolet Silverado 3500 HD LT 2020 Chevrolet Silverado 3500 HD LTZ 2020 Chevrolet Silverado 3500 HD WT 2020 GMC Sierra 2500 HD Base 2020 GMC Sierra 2500 HD Denali 2020 GMC Sierra 2500 HD SLE 2020 GMC Sierra 2500 HD SLT 2020 GMC Sierra 3500 HD Base 2020 GMC Sierra 3500 HD Denali 2020 GMC Sierra 3500 HD SLE 2020 GMC Sierra 3500 HD SLT 2021 Chevrolet Silverado 2500 HD Custom 2021 Chevrolet Silverado 2500 HD High Country 2021 Chevrolet Silverado 2500 HD LT 2021 Chevrolet Silverado 2500 HD LTZ 2021 Chevrolet Silverado 2500 HD WT 2021 Chevrolet Silverado 3500 HD High Country 2021 Chevrolet Silverado 3500 HD LT 2021 Chevrolet Silverado 3500 HD LTZ 2021 Chevrolet Silverado 3500 HD WT 2021 GMC Sierra 2500 HD Base 2021 GMC Sierra 2500 HD Denali 2021 GMC Sierra 2500 HD SLE 2021 GMC Sierra 2500 HD SLT 2021 GMC Sierra 3500 HD Base 2021 GMC Sierra 3500 HD Denali 2021 GMC Sierra 3500 HD SLE 2021 GMC Sierra 3500 HD SLT