Speed Cal and 4.10 Gears Kit

BUY THE KIT AND SAVE OVER $35!

Wanting to change your rear-end gear ratio but worried about your speedometer being accurate? Don't wish to spend tons of money on a tuner? Well then this kit was designed with you in mind! Multiply your gear ratio without breaking the bank.

Designed by a American Muscle forum user, this kit provides you with nothing but the best of the best in products; the Dallas Mustang Speedcal, Ford Racing 4.10 Gears, and 3 Royal Purple 75w90 synthetic gear oils. Everything that you need for your rear end upgrade is provided for you, all you need to do is add the mechanic and a lead foot.

Note: The Dallas Mustang Speedcal will only work with 1994-2004 manual transmissions and 1994-1998 automatic transmissions. This gear kit is for the Ford 8.8" Rear End.