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--(1) Removable Thermostat--(2) 7/8-inch X 14 Quick-Disconnect Transmission Line Fittings--(1) Transmission Line Mounting Plate--(1) Transmission Line Mounting Plate Bolt--(1) Removable Thermostat Bypass w/ Installation Hardware--(1) Assembly Notecard--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 Mishimoto Activation Temperature (F): 185
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
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
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 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.
