Ford F-150 Transmission Fluid Service Guide: 10-Speed (10R80/10R60)

The 10R80 (EcoBoost/V8) and 10R60 (smaller-engine) 10-speed automatics shift more frequently than older 6-speeds to keep the engine in an efficient band. Under trailer load, that means more clutch engagements and more heat cycling per mile than a lightly loaded truck sees.

A truck that just finished a long tow and then shifts harshly, hesitates, or flares between gears is telling you the fluid worked hard. Don't ignore it — trans fluid breakdown compounds quickly once it starts.

Learn more in our best brakes for heavy towing guide.