Originally Posted by robb15033
500 miles and then change the fluid using a high quality product, and then always add Fords friction additive.
Our Mustang shop uses Amsoil & Ford additive in the differential. They use different brands for different components all through out the car.
Try to refrain from "ripping the tires off" until your gears have had time to "break in" a bit and seat together.
P.S. I never could, and I guess I got lucky 'cause it never hurt anything.