Eaton 19659-010 Elocker 30 Spline Differential with 10 Bolt for GM Car/Truck 1988-Up GM Car/Truck 30-Spline Axles 8.5''/8.6'' Diameter Ring Gear Fits 2.73 & Up Gear Ratios Requires special bearings. For axles with small bearing bores (race O.D. of 2.89'') use bearing LM-102949 and race LM-102911. For axles with large bearing bores (race O.D. of 3.06'') use bearing LM-603049 and race LM-603012.