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The Mishimoto Full-Flow Thermal Bypass Valve Kit improves transmission cooling for 2017+ Chevrolet and GMC trucks with the 6.6L Duramax L5P engine.
Key Features:
Model-Specific Fit: Designed to directly replace the stock bypass valve on 2017 and newer Chevrolet and GMC 6.6L Duramax L5P models.
Bypass Elimination: Removes the factory thermostat to allow full-time fluid flow to the cooler, reducing heat buildup.
CNC-Machined Quality: Manufactured from billet aluminum with precision machining for tight tolerances and long-term reliability.
Cooling Efficiency: Integrated cooling fins on the valve body help increase surface area for better heat dissipation.
Protective Finish: Anodized black coating adds corrosion resistance and a clean, durable appearance.
Simple Installation: Can be installed in under an hour with basic tools—no cutting or special modifications required.
Improved Fluid Flow: Offers reduced restriction compared to the OEM valve, supporting stable transmission temperatures.
Reliability Upgrade: Addresses a known weak point in the factory system to improve performance and longevity.
Warranty Coverage: Comes with Mishimoto’s lifetime warranty for added peace of mind.
This kit is a reliable solution for maintaining transmission performance, especially under towing, hauling, or high-heat driving conditions.
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 |
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