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HomeShopTransmission CoolersMishimoto Full-Flow Transmission Thermal Bypass Valve Kit for Chevy and GMC Duramax L5P 6.6L (2017-2019)
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Mishimoto Full-Flow Transmission Thermal Bypass Valve Kit for Chevy and GMC Duramax L5P 6.6L (2017-2019)
Mishimoto Full-Flow Transmission Thermal Bypass Valve Kit for Chevy and GMC Duramax L5P 6.6L (2017-2019) - Image 2
Mishimoto Full-Flow Transmission Thermal Bypass Valve Kit for Chevy and GMC Duramax L5P 6.6L (2017-2019) - Image 3
Mishimoto Full-Flow Transmission Thermal Bypass Valve Kit for Chevy and GMC Duramax L5P 6.6L (2017-2019) - Image 4
Mishimoto Full-Flow Transmission Thermal Bypass Valve Kit for Chevy and GMC Duramax L5P 6.6L (2017-2019) - Image 5
Mishimoto Full-Flow Transmission Thermal Bypass Valve Kit for Chevy and GMC Duramax L5P 6.6L (2017-2019) - Image 6
Mishimoto Full-Flow Transmission Thermal Bypass Valve Kit for Chevy and GMC Duramax L5P 6.6L (2017-2019) - Image 7
Mishimoto Full-Flow Transmission Thermal Bypass Valve Kit for Chevy and GMC Duramax L5P 6.6L (2017-2019) - Image 8
Mishimoto Full-Flow Transmission Thermal Bypass Valve Kit for Chevy and GMC Duramax L5P 6.6L (2017-2019) - Image 9
Mishimoto Full-Flow Transmission Thermal Bypass Valve Kit for Chevy and GMC Duramax L5P 6.6L (2017-2019) - Image 10

Mishimoto Full-Flow Transmission Thermal Bypass Valve Kit for Chevy and GMC Duramax L5P 6.6L (2017-2019)

SKU: MMTC-L5P-TBVFF

Original price was: $110.00.Current price is: $99.95.

In stock

7 in stock

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 2017-2019 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 adds even more heat dissipation. This 2017-2019 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. Full-Flow Transmission Thermal Bypass Valve Kit, fits Chevrolet/GMC 6.6L Duramax L5P 17-19
  • Durable CNC-machined billet-aluminum construction
  • Eliminates failure-prone bypass valve
  • Installs in less than 1 hour
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Description

The Mishimoto Full-Flow Transmission Thermal Bypass Valve Kit is specifically designed for the 2017-2019 Chevrolet Silverado and GMC Sierra 2500 and 3500 HD trucks equipped with the 6.6L Duramax L5P engine. This upgrade enhances your vehicle’s cooling system by eliminating the stock, failure-prone thermal bypass valve that can restrict fluid flow and cause overheating. Crafted from CNC-machined billet aluminum, the valve offers superior durability and a sleek appearance, while its integrated cooling fins help dissipate heat more effectively. This ensures optimal transmission fluid temperature management, especially during heavy towing or operation in warm climates. The installation process is straightforward, typically taking less than an hour, making it a practical upgrade for both professional technicians and DIY enthusiasts. The kit’s full-flow design guarantees consistent fluid delivery to the transmission cooler under all operating conditions, promoting longevity and performance of your transmission. Built with longevity in mind, the Mishimoto valve features a durable black anodized finish and is backed by a lifetime warranty, providing peace of mind with your investment. Whether you’re looking to improve cooling efficiency, prevent overheating, or enhance the overall reliability of your truck’s transmission system, this bypass valve kit is an essential upgrade for your Duramax-powered vehicle. Designed to fit the specified model years and compatible with your vehicle’s existing transmission cooling setup, this kit ensures a seamless upgrade that maximizes transmission performance and durability.

Features:

  • Durable CNC-machined billet aluminum construction for longevity and strength
  • Eliminates failure-prone internal thermostat for consistent full-flow cooling
  • Integrated cooling fins enhance heat dissipation for better temperature control
  • Easy installation in less than one hour, designed for a direct fit
  • Compatible with 2017-2019 Chevrolet Silverado 2500 HD, 3500 HD, and GMC Sierra 2500 HD, 3500 HD with 6.6L Duramax L5P engine
  • Backed by Mishimoto’s lifetime warranty for peace of mind

Fitment:
Chevrolet Silverado 2500 HD Custom 2021
Chevrolet Silverado 2500 HD High Country 2017
Chevrolet Silverado 2500 HD High Country 2018
Chevrolet Silverado 2500 HD High Country 2019
Chevrolet Silverado 2500 HD High Country 2020
Chevrolet Silverado 2500 HD High Country 2021
Chevrolet Silverado 2500 HD LT 2017
Chevrolet Silverado 2500 HD LT 2018
Chevrolet Silverado 2500 HD LT 2019
Chevrolet Silverado 2500 HD LT 2020
Chevrolet Silverado 2500 HD LT 2021
Chevrolet Silverado 2500 HD LTZ 2017
Chevrolet Silverado 2500 HD LTZ 2018
Chevrolet Silverado 2500 HD LTZ 2019
Chevrolet Silverado 2500 HD LTZ 2020
Chevrolet Silverado 2500 HD LTZ 2021
Chevrolet Silverado 2500 HD WT 2017
Chevrolet Silverado 2500 HD WT 2018
Chevrolet Silverado 2500 HD WT 2019
Chevrolet Silverado 2500 HD WT 2020
Chevrolet Silverado 2500 HD WT 2021
Chevrolet Silverado 3500 HD High Country 2017
Chevrolet Silverado 3500 HD High Country 2018
Chevrolet Silverado 3500 HD High Country 2019
Chevrolet Silverado 3500 HD High Country 2020
Chevrolet Silverado 3500 HD High Country 2021
Chevrolet Silverado 3500 HD LT 2017
Chevrolet Silverado 3500 HD LT 2018
Chevrolet Silverado 3500 HD LT 2019
Chevrolet Silverado 3500 HD LT 2020
Chevrolet Silverado 3500 HD LT 2021
Chevrolet Silverado 3500 HD LTZ 2017
Chevrolet Silverado 3500 HD LTZ 2018
Chevrolet Silverado 3500 HD LTZ 2019
Chevrolet Silverado 3500 HD LTZ 2020
Chevrolet Silverado 3500 HD LTZ 2021
Chevrolet Silverado 3500 HD WT 2017
Chevrolet Silverado 3500 HD WT 2018
Chevrolet Silverado 3500 HD WT 2019
Chevrolet Silverado 3500 HD WT 2020
Chevrolet Silverado 3500 HD WT 2021
GMC Sierra 2500 HD AT4 2020
GMC Sierra 2500 HD AT4 2021
GMC Sierra 2500 HD Base 2017
GMC Sierra 2500 HD Base 2018
GMC Sierra 2500 HD Base 2019
GMC Sierra 2500 HD Base 2020
GMC Sierra 2500 HD Base 2021
GMC Sierra 2500 HD Denali 2017
GMC Sierra 2500 HD Denali 2018
GMC Sierra 2500 HD Denali 2019
GMC Sierra 2500 HD Denali 2020
GMC Sierra 2500 HD Denali 2021
GMC Sierra 2500 HD SLE 2017
GMC Sierra 2500 HD SLE 2018
GMC Sierra 2500 HD SLE 2019
GMC Sierra 2500 HD SLE 2020
GMC Sierra 2500 HD SLE 2021
GMC Sierra 2500 HD SLT 2017
GMC Sierra 2500 HD SLT 2018
GMC Sierra 2500 HD SLT 2019
GMC Sierra 2500 HD SLT 2020
GMC Sierra 2500 HD SLT 2021
GMC Sierra 3500 HD AT4 2020
GMC Sierra 3500 HD AT4 2021
GMC Sierra 3500 HD Base 2017
GMC Sierra 3500 HD Base 2018
GMC Sierra 3500 HD Base 2019
GMC Sierra 3500 HD Base 2020
GMC Sierra 3500 HD Base 2021
GMC Sierra 3500 HD Denali 2017
GMC Sierra 3500 HD Denali 2018
GMC Sierra 3500 HD Denali 2019
GMC Sierra 3500 HD Denali 2020
GMC Sierra 3500 HD Denali 2021
GMC Sierra 3500 HD SLE 2017
GMC Sierra 3500 HD SLE 2018
GMC Sierra 3500 HD SLE 2019
GMC Sierra 3500 HD SLE 2020
GMC Sierra 3500 HD SLE 2021
GMC Sierra 3500 HD SLT 2017
GMC Sierra 3500 HD SLT 2018
GMC Sierra 3500 HD SLT 2019
GMC Sierra 3500 HD SLT 2020
GMC Sierra 3500 HD SLT 2021

Additional information

Weight 1.4 lbs
Dimensions 9 × 8 × 2 in
air_freight_prohibited

false
not_carb_approved

false
ltl_freight_required

false
prop_65

Y
part_type

automotive
epa

N/A
carb_acknowledgement_required

false
regular_stock

t
upc

840197710609
brand

Mishimoto
part_number

MMTC-L5P-TBVFF

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