Auburn Gear 542052 Pro Series Limited Slip Differential Gm 8 1/2 Includes Bearings 30 Teeth, 10 Bolt, 2.73 & Up Ratios Made in the USA for those who want to turn their Torque up another notch offering an even higher bias ratio and faster sensing reaction than HP Series for the very best controlled power transfer. High Bias Cone Clutch design provides High Torque & High Preload making it the Ultimate Slip Differential for true performance. Product may vary from the Image shown due to your vehicles application.