2015-2023 Mustang Yukon 4.11 Gears & Install Kit by Yukon

Yukon 4.11 Gears & Install Kit
Upgrade the rear gears in your 2015-2023 Mustang with a set of Yukon 4.11 gears for your Ford 8.8" equipped IRS rear axle. Your factory gears are built to maximize fuel mileage, which leaves much to be desired in the performance department. A gear change can provide a night and day difference when it comes to launching your Mustang at the track. While these Yukon gears do not increase horsepower, they will definitely allow your Mustang to get the most out of your low-end torque! Included in this kit is the 4.11 Yukon gear set, matching install kit, a bottle of Ford Racing friction modifier, and two quarts of 75w-140 Royal Purple Max-Gear gear oil.

4.11 Ring & Pinion
Fitting the Ford 8.8" rear axle featuring a 4.11 gear ratio as well as the correct larger pinion bearing journals and pinion splines. Yukon engineers use state-of-the-art design, advanced heat-treating techniques, and leading-edge quality testing processes to ensure quality standards. Whether you’ve added tons of horsepower under the hood, upgraded to suspension, or just want to optimize the traction performance of your S550, a Yukon 4.11 gear set will be the perfect addition.

Ring & Pinion Super Install Kits
Ford Performance install kit can help you get the job done quickly and easily with everything you need to install your new gears. There are close tolerances that have to be met to ensure proper gear life. This rear gear installation kit comes with all the necessary shims and marking compound to ensure you have a proper wear pattern on the gears as well as new bearings and races to go along with your new gear set. Coming with complete, specific kits for the Ford IRS 8.8" rear axle, you are sure to have everything you need. 

Royal Purple Max-Gear Gear Oil
Royal Purple Max-Gear gear oil is an ultra-tough automotive gear oil. It is designed to maximize power and provide unsurpassed protection to heavily loaded gears. It makes gears run smoother, quieter, cooler, and longer without overhauls. Max-Gear outperforms other gear oils because it combines the highest quality synthetic oils with Royal Purple’s proprietary Synslide additive technology.

Ford Racing Friction Modifier
Ford Performance Friction Modifier fluid is a specially formulated additive to provide smooth operation of clutch-type limited-slip differentials. One bottle of friction modifier is required when changing the gear oil in rear ends equipped with Ford traction-lok units. When making a turn, the outer wheels of your Mustang must travel faster than the inner wheels. It is up to the differential to act as a balance arm, establishing a constant equilibrium of torques and forces between the left-hand and right-hand driven wheels. In standard (or open) differentials, power is directed to the wheel offering the least resistance. This works well when making a turn, but in a situation where one wheel is lifted off the ground, it causes the suspended wheel to turn while the other remains motionless.