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

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.

This Part Fits:

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	High Country
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	SLE
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

Please note image may vary from product. Also, some items are special order. If delivery time is a concern, please contact us prior to purchase. 

Fidanza Performance is excited to offer the go to name in cooling- Mishimoto!

About Mishimoto-

Mishimoto is a go to brand in the automotive performance world, especially when it comes to keeping engines cool. Wanna know what makes Mishimoto awesome? Lets take a look!
What they offer-
Cooling Solutions: Mishimoto specializes in designing and manufacturing performance cooling system upgrades. This means they make parts that help your car's engine stay at the optimal temperature, even when you're pushing it hard.  
Wide Range of Products: They offer a huge variety of cooling components, including:
Radiators  
Intercoolers  
Hoses  
Fans  
Thermostats  
Oil coolers  
And much more!
 
Target Markets-
Car Enthusiasts: Mishimoto caters to people who are passionate about cars and want to improve their performance. This includes everyone from weekend racers to those who just want a more reliable daily driver.  
Performance-Minded Drivers: If you're someone who likes to push your car to its limits, Mishimoto products can help prevent overheating and ensure your engine stays healthy.
DIYers and Mechanics: Their parts are designed to be a direct fit for many vehicles, making installation easier for those who like to work on their own cars.  
Why they're popular:
Quality: Mishimoto has a reputation for producing high-quality, durable parts that can withstand the stresses of performance driving.
Performance: Their products are designed to improve cooling efficiency, which can lead to increased horsepower and torque, as well as better engine longevity.  
Innovation: Mishimoto invests in research and development to create new and innovative cooling technologies.
Lifetime Warranty: Many of their products come with a lifetime warranty, which gives customers peace of mind.  
Community: Mishimoto is actively involved in the automotive community, sponsoring events and engaging with enthusiasts online.  

Fidanza Performance, founded in 1997, is a leading US manufacturer of high-quality lightweight aluminum flywheels, precision adjustable cam gears, and high-performance clutches. With nearly 20 years in the automotive performance market, Fidanza is renowned for its expertise and respected globally, offering products for a wide range of vehicles, from European sports cars to modern muscle cars and imports. The company originated in racing, with founder Lou Fidanza's success in the SCCA leading to the creation of specialty parts like aluminum flywheels. Fidanza has since expanded its product line to include cam gears and performance clutches, gaining a loyal customer base and worldwide recognition. In 2023 Fidanza opened the SpeedParts4Less Marketplace which sells other manufacturers quality high performance parts!