This kit dramatically improves traction and durability by adding a Yukon Dura Grip LSD and an upgraded ring and pinion set to your diff. Its also an opportunity to generate next-level acceleration by moving to a more aggressive gear ratio.

Features:

Fits GM 8.5 differential Fits 2.93 to 3.23 cases 27 spline pinion gear 3.90 ratio Includes Dura Grip positraction LSD, 28 spline Coverage includes 64 to 72 Olds 442, 65 to 71 GTO, 3 other models, or anything hot-rodded with a GM 8.5 diff 12 bolt ring gear Includes positraction unit, ring and pinion gear set, and all required bearings and installation hardware

Details:

• AAP Selling Package Quantity UOM: EA
• Aap uda 12: EA
• Aap uda 22: 1

Fitment Notes:

• GM 8.5 inch. Rear
• Oldsmobile & Pontiac
• Gear and Install Kit Package
• Includes 3.90 Ratio Gear Set, Master Install Kit, and 28 Spline Limited Slip Differential