10.5 Inch GM 14 Bolt 4.56 Thick Rear Ring & Pinion & Install Kit USA Standard GearUSA Standard 10. 5 inch GM 14 Bolt, 4. 56 Ratio Thick Rear Ring and Pinion Gear Set and Master Install Kit Package Details: Rear Differential 10. 5 inch GM Gear Ratio 4. 56 Location Rear Structured Ring and Pinion Install Kit Warranty Warrantied against manufacturing defects for one (1) year Sold As Kit Features: For Applications with 14 Bolt Rear Cover and 12 Bolt Ring Gear Quick Kits feature USA Standard ring and pinion gear set, Master Install kit