TechSpec Applications: GMC Sierra 2500HD V8 (6.6L Diesel) 2017+--GMC Sierra 3500HD V8 (6.6L Diesel) 2017+--Chevrolet Silverado 2500HD V8 (6.6L Diesel) 2017+--Chevrolet Silverado 3500HD V8 (6.6L Diesel) 2017+
TechSpec Engine Codes: L5P--6.6L Duramax
TechSpec Chassis Codes: 2500--3500
TechSpec Includes: (1) CNC-Machined Billet Aluminum Thermal Bypass Valve--(2) 7/8-inch X 14 Quick-Disconnect Transmission Line Fittings--(1) Transmission Line Mounting Plate--(1) Transmission Line Mounting Plate Bolt--Mishimoto Lifetime Warranty
Note: 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----
TechSpec OEM Activation Temperature (F): 185
Features:Direct fit for 2017+ Chevrolet/GMC 6.6L Duramax L5P
Installs in less than 1 hour
Eliminates failure-prone bypass valve
Durable CNC-machined billet-aluminum construction
Full-flow bypass allows the transmission cooler to operate at maximum efficiency
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
Install Difficulty: 1
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.
