Mishimoto Thermal Bypass Valve Kit for 2017-2020 Ford F-150 10R80 (3.5L)

Fits 2017-2020 Ford F-150 (all trims including Raptor, Lariat, and King Ranch) equipped with the 3.5L engine and 10R80 transmission.

The 10R80 transmission is a robust unit, but the factory-equipped thermal bypass valve is a known weak point. This OE valve often malfunctions, restricting or entirely blocking fluid flow to the external transmission cooler. Such failures lead to rapid fluid temperature spikes, potential gear damage, and dashboard warning lights. The Mishimoto thermal bypass valve kit (MPN: MMTC-RPTR-TBV) solves this by replacing the stock unit with a durable, CNC-machined billet aluminum housing.

This kit includes a fully serviceable 160°F thermostat that ensures your transmission reaches operating temperature quickly in cold climates while maintaining optimal cooling during standard use. For owners in extreme heat or those frequently towing, the kit also includes a full-flow bypass assembly. This bypass allows constant fluid flow to the transmission cooler regardless of temperature, providing maximum protection against overheating. Installation is straightforward and typically takes about one hour using factory mounting points.

• Durable CNC-machined billet-aluminum construction replaces failure-prone plastic/cast OE units
• Includes 160°F serviceable thermostat for balanced thermal management
• Includes full-flow bypass pin for maximum cooling in extreme towing or hot climate conditions
• Helps prevent transmission overheating and extends fluid life
• Manufacturer Part Number: MMTC-RPTR-TBV
• Mishimoto Lifetime Warranty