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.

This Part Fits:

YearMakeModelSubmodel2021ChevroletSilverado 2500 HDCustom2017-2021ChevroletSilverado 2500 HDHigh Country2017-2021ChevroletSilverado 2500 HDLT2017-2021ChevroletSilverado 2500 HDLTZ2017-2021ChevroletSilverado 2500 HDWT2017-2021ChevroletSilverado 3500 HDHigh Country2017-2021ChevroletSilverado 3500 HDLT2017-2021ChevroletSilverado 3500 HDLTZ2017-2021ChevroletSilverado 3500 HDWT2020-2021GMCSierra 2500 HDAT42017-2021GMCSierra 2500 HDBase2017-2021GMCSierra 2500 HDDenali2017-2021GMCSierra 2500 HDSLE2017-2021GMCSierra 2500 HDSLT2020-2021GMCSierra 3500 HDAT42017-2021GMCSierra 3500 HDBase2017-2021GMCSierra 3500 HDDenali2017-2021GMCSierra 3500 HDSLE2017-2021GMCSierra 3500 HDSLT

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