Tired of doing a one wheel burnout in your 1979-93 Mustang? Get both wheels spinning with a new traction-lok differential. Ford Racing offers the same 31 spline differential found in 03/04 Cobras as a replacement for your 28 spline. This is the perfect upgrade for higher horsepower Fox Body's. Need a more economical solution? Rebuild it with Yukon and Ford Racing's Traction-lok rebuild kits for 8.8" and 7.5" rear ends. Each kit includes all of the carbon friction discs, shims and cross pin bolt you need to rebuild your differential stronger than it was before.