Fits 8.8" Traction-Lok differentials prior to 2015-2016 Mustang. Will not fit 2015-2016 Mustang Super 8.8" Fits 8.8" Traction-Lok differentials prior to 2015-2016 Mustang. Will not fit 2015-2016 Mustang Super 8.8" Kit includes: Clutch pack Shims Differential pin lock bolt with thread lock Friction modifier CM-19546-A1