These Ford Performance Mustang gears are a great way to get faster acceleration and quicker track times. Offered in 3.31, 3.55, 3.73, and 4.10. you can pick the perfect set for your 8.8" and 7.5" rear end. These Mustang gear kits are offered with just the ring and pinion or in a gear installation kit. These kits include Royal Purple gear oil, friction modifier, a gear installation kit, and a new differential gasket. Want to learn how to install gears in your Mustang? Follow along with our tech video to help you with your installation.