GM 7.5in. 10 Bolt 4.56 O.E.M. Ratio For Use With 3.23 And Up Carrier;Will Fit 7.6in. Axle;10 Year Warranty;Computer Heat Treated 8620 Steel;Manufactured To O.E. Specifications;Double Shot Peened;Double Lapped G2 Axle and Gear G2 GM 7.5 Inch 10 Bolt 4.56 O.E.M. Ratio Ring and Pinion - 1-2015-456 1-2015-456 Ring and Pinions