Mishimoto 2017+ Ford Raptor 10R80 Thermal Bypass Valve KitThe 10R80 transmission found in your 2017+ Raptor 3. 5L EcoBoost may be new to the scene, but it's proving capable of handling the power of the potent 3. 5L. As with any newly developed product, however, time and mileage tend to reveal any shortcomings. One major weak point of the 10R80 is the factory equipped thermal bypass valve. This valve controls transmission fluid flow to the external cooler, and many reports of failures are beginning to