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

Mishimoto
MISMMTC-L5P-TBV
840197710616
Transmission Coolers
20 Units In Stock - Ships Next Business Day
$ 146.00 $ 132.95
$ 132.95

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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 thermal bypass valve upgrade for your 2017+ Chevrolet/GMC 6.6L Duramax. Our CNC-machined aluminum thermal bypass valve not only looks better than the stock unit, but it performs better too. This Mishimoto thermal bypass valve kit includes a fully serviceable thermostat for fast warm-up in cold climates. This kit also includes a thermostat bypass that can be installed to provide constant cooling in warm climates or for use in extreme driving/towing conditions. 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 Thermal Bypass Valve Kit is built to last a lifetime with a durable black anodized finish and our Mishimoto Lifetime Warranty.
Fitment
Year
Make
Model
Submodel
2021
Chevrolet
Silverado 2500 HD
Custom
2017 - 2021
Chevrolet
Silverado 2500 HD
High Country
2017 - 2021
Chevrolet
Silverado 2500 HD
LT
2017 - 2021
Chevrolet
Silverado 2500 HD
LTZ
2017 - 2021
Chevrolet
Silverado 2500 HD
WT
2017 - 2021
Chevrolet
Silverado 3500 HD
LT
2017 - 2021
Chevrolet
Silverado 3500 HD
LTZ
2017 - 2021
Chevrolet
Silverado 3500 HD
WT
2020 - 2021
GMC
Sierra 2500 HD
AT4
2017 - 2021
GMC
Sierra 2500 HD
Base
2017 - 2021
GMC
Sierra 2500 HD
Denali
2017 - 2021
GMC
Sierra 2500 HD
SLT
2020 - 2021
GMC
Sierra 3500 HD
AT4
2017 - 2021
GMC
Sierra 3500 HD
Base
2017 - 2021
GMC
Sierra 3500 HD
Denali
2017 - 2021
GMC
Sierra 3500 HD
SLE
2017 - 2021
GMC
Sierra 3500 HD
SLT

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