Yukon Gear YGK2320 Rear Ring/Pinion Kit for Buick/Chevy/Pontiac

Kit contains a ring and pinion set, positraction unit, and installation parts Fits GM 12P differential 30 spline pinion gear 3.31 ratio Includes Dura Grip positraction LSD, 30 spline Coverage includes ’64 to ’72 Chevelle, ’67 to ’72 Camaro, ’69 to ’72 Firebird, ’70 to ’72 GTO, 9 other models, or anything