New Parts launched for GM Duramax, Dodge/Ram Cummins and Ford Powerstroke

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Steadier Transmission Temps

The factory transmission thermal bypass can let fluid run hotter than you want, especially towing. This high-flow thermal bypass valve kit improves how the Duramax manages transmission fluid temperature for steadier, cooler trans temps.

Fits these trucks

  • 2017–2025 GMC/Chevy 6.6L Duramax — high-flow transmission thermal bypass valve kit

Frequently Asked Questions

What does a thermal bypass valve kit do?
It improves how the transmission manages fluid temperature, giving steadier, cooler trans temps — especially under towing.
Do I need it?
If you tow or want tighter control of transmission temperature on a newer Duramax, it's a worthwhile upgrade.
Will it fit my truck?
Fits the 2017–2025 6.6L Duramax. Match your year on the product page. Get the right part the first time.