Does your 1979-1993 Mustang have one wheel peel? Get a new traction-lok/differential from 5.0 Resto. Our performance 31 spline differentials from Ford Racing are the perfect upgrade for high horsepower Foxbodys. These differentials are the same ones found in 03/04 Cobra with carbon fiber clutches built to handle the abuse of the track. Need a more affordable option? Rebuild yours with either a Ford Racing or Yukon Trac-loc rebuild kit for 8.8" and 7.5" rear ends. Our kits come with all of the necessary carbon discs, shims, and cross pin bolts you need to build your differential to exceed O.E.M. standards. Fits 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, and 1993 Mustangs.