2017-2019 Duramax L5P Mishimoto Thermal Bypass Valve Features:
- Direct fit for 2017+ Chevrolet/GMC 6.6L Duramax L5P
- Installs in less than 1 hour
- Durable CNC-machined billet aluminum design
- Includes fully-serviceable thermostat for fast warm-up in cold climates and thermostat bypass for constant cooling in hot climates
- Helps extend transmission life and prevent overheating
- Fits with stock transmission cooler piping, requiring no modification for installation
- Integrated heat-sink fins provide unique styling and added heat dissipation
- Durable anodized finish
- Mishimoto Lifetime Warranty
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.
Specifications:
- Mishimoto Activation Temperature (F): 185
- OEM Activation Temperature (F): 185
Mishimoto does not recommend customers in cold climates install the thermostat bypass to avoid overcooling of the transmission fluid
This performance thermostatic bypass valve only fits vehicles equipped with the Allison automatic transmission
Fitment:
- 2017-2019 Silverado 2500 6.6L Duramax L5P with Allison 1000 Transmission
- 2017-2019 Silverado 3500 6.6L Duramax L5P with Allison 1000 Transmission
- 2017-2019 Sierra 2500 6.6L Duramax L5P with Allison 1000 Transmission
- 2017-2019 Sierra 3500 6.6L Duramax L5P with Allison 1000 Transmission
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