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  See more parts for Chevrolet Silverado 2500 HD
Select the year of your Chevrolet Silverado 2500 HD:
Mishimoto Transmission Thermal Bypass Valve Kit GMC Sierra | Chevrolet Silverado 2500 | 3500 HD 2017-2021 - MMTC-L5P-TBV
The Allison transmission is the backbone of your L5P Duramax. Its responsible for transmitting large quantities of torque from your V8 diesel powerplant. This torque generates a lot of heat, and if that heat isnt 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. Thats 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 finis and our Mishimoto Lifetime Warranty.

Purchase 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


Features:
  • Direct fit for 2017+ Chevrolet/GMC 6.6L Duramax L5P
  • Durable anodized finish
  • Durable CNC-machined billet aluminum construction
  • Eliminates failure-prone bypass valve
  • Fits with stock transmission cooler piping, requiring no modification for installation
  • Helps extend transmission life and prevent overheating
  • Includes fully-serviceable thermostat for fast warm-up in cold climates and thermostat bypass for constant cooling in hot climates
  • Installs in less than 1 hour
  • Integrated heat-sink fins provide unique styling and added heat dissipation
  • Mishimoto Lifetime Warranty


Specifications:
  • Mishimoto Activation Temperature Degree F: 185
  • OEM Activation Temperature Degree F: 185
  • Vehicle Specifications:
    • Chassis Codes: 2500 | 3500
    • Engine Codes: L5P 6.6L Duramax


Fitment:
  • Chevrolet Silverado 2500 HD Custom V8 (6.6L Diesel) 2021
  • Chevrolet Silverado 2500 HD High Country V8 (6.6L Diesel) 2017-2021
  • Chevrolet Silverado 2500 HD LT V8 (6.6L Diesel) 2017-2021
  • Chevrolet Silverado 2500 HD LTZ V8 (6.6L Diesel) 2017-2021
  • Chevrolet Silverado 2500 HD WT V8 (6.6L Diesel) 2017-2021
  • Chevrolet Silverado 3500 HD High Country V8 (6.6L Diesel) 2017-2021
  • Chevrolet Silverado 3500 HD LT V8 (6.6L Diesel) 2017-2021
  • Chevrolet Silverado 3500 HD LTZ V8 (6.6L Diesel) 2017-2021
  • Chevrolet Silverado 3500 HD WT V8 (6.6L Diesel) 2017-2021
  • GMC Sierra 2500 HD AT4 V8 (6.6L Diesel) 2020-2021
  • GMC Sierra 2500 HD Base V8 (6.6L Diesel) 2017-2021
  • GMC Sierra 2500 HD Denali V8 (6.6L Diesel) 2017-2021
  • GMC Sierra 2500 HD SLE V8 (6.6L Diesel) 2017-2021
  • GMC Sierra 2500 HD SLT V8 (6.6L Diesel) 2017-2021
  • GMC Sierra 3500 HD AT4 V8 (6.6L Diesel) 2020-2021
  • GMC Sierra 3500 HD Base V8 (6.6L Diesel) 2017-2021
  • GMC Sierra 3500 HD Denali V8 (6.6L Diesel) 2017-2021
  • GMC Sierra 3500 HD SLE V8 (6.6L Diesel) 2017-2021
  • GMC Sierra 3500 HD SLT V8 (6.6L Diesel) 2017-2021

Other Part Numbers:
Mishimoto #misMMTC-L5P-TBV

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
2020-2021
 Chevrolet Silverado 2500 HD
2020-2021
 Chevrolet Silverado 3500 HD
2017-2021
 GMC Sierra

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Who is Mishimoto?

Mishimoto is an aftermarket automotive company that was established in 2005. They are known for creating the industry’s best performing cooling system components. Today, they have become the market leader and has been chosen by various enthusiasts worldwide.

Parts for All Your Cooling Needs

Mishimoto offers a wide range of products such as couplings, radiators, fans, and other cooling system components for practically every vehicle, may it be a sport compact, truck, jeep, muscle cars, and classic vehicles. They also offer intake systems and intercoolers that help the vehicle gain more horsepower.

Built to Perform Better

The company creates products that are better than the stock components. Their parts are designed to work in higher pressure ratings and are more robust. Hence, they are the brand of choice by tuners and enthusiasts who demand a cooling system that can work for high-performance applications. Many racers choose Mishimoto as it has proven itself to produce race winners whatever racing discipline it is, may it be circuit racing, drag racing, drifting, and off road racing.

Purchase Mishimoto Products at Vivid Racing

Your vehicle cooling system plays a critical role in your vehicle. It keeps the temperature at bay and prevents severe damages caused by overheating. If you want a product that can put your trust in, then Mishimoto is the brand for you. Tested by many racers on the track and a variety of car enthusiasts on the street, you can be sure that you will never go wrong with Mishimoto.

Visit Vivid Racing and check out their list of products that would fit your specific needs.











Mishimoto Automotive ("Mishimoto") warrants its products under this lifetime limited warranty policy ("Warranty Policy"). This Warranty Policy applies solely to: (i) Mishimoto Products purchased directly from Mishimoto or Mishimoto authorized dealers (each a "Mishimoto Product" and collectively, the "Mishimoto Products") and (ii) the original purchaser of such Mishimoto Product ("Purchaser"). This Warranty Policy is non-transferable and all claims under this Warranty Policy must be accompanied by the original sales receipt. The terms and conditions of this Warranty Policy are subject to change by Mishimoto at any time without notice.

Pursuant to the terms and conditions of this Warranty Policy, after submission of a valid claim by a Purchaser and regardless of the condition of the product for which such valid claim is submitted, if it is determined by Mishimoto that such Mishimoto Product was not manufactured to Mishimoto's advertised specifications or if such claim was submitted pursuant to Mishimoto's Accident Protection Plan, as described herein, Mishimoto will, at its discretion: (i) repair or replace Purchaser's original Mishimoto Product; (ii) replace Purchaser's original Mishimoto Product with the most current available model (if, for example, the original model of the product for which a valid claim has been submitted is not available); or (iii) provide the purchaser with a gift card redeemable at Mishimoto.com in the amount of the original purchase price of the original Mishimoto Product (if, for example, Mishimoto has discontinued support for a Purchaser's specific application).

To submit a claim for a Mishimoto Product under this Warranty Policy, you must: (i) fully and accurately fill out the online form provided below; and (ii) provide Mishimoto with a copy of an original sales receipt indicating that you are the original Purchaser of the Mishimoto Product for which the claim is being submitted (you must also provide the information described in the paragraph of this Warranty Policy titled "Mishimoto Accident Protection Plan" if you are submitting a claim for a Mishimoto Product damaged in an accident). In addition, if requested by Mishimoto, you must also send the Mishimoto Product for which a claim is being made, all transportation expenses prepaid, to Mishimoto.

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