4.56 ring and pinion gear set;For applications with 14 bolt rear cover and 12 bolt ring gear;Includes NP673386/NP516549 Inner pinion bearing and Race with 4.375 outside diameter;Quick Kits feature USA Standard ring and pinion gear set, Master Install kit with high quality Koyo bearings and the necessary small parts;The gear and install kit includes Yukon Dura Grip Clutch Style Limited Slip (LSD); All positraction units are fully rebuildable;The ring gear diameter is 11.5;4.375 OD pinion bearing;California Residents: WARNING USA Standard is proud to be the industry?s leading supplier of quality parts at an affordable price. As a company who has provided the drivetrain world with the widest selection of differential parts for over 20 years, our focus has remained dedicated to the industry we serve. Our new Quick Kits draw from years of technical data and were made specifically with mechanics, installers and you in mind. USA Quick Kits are a one-step shopping experience that combine associated parts for most differential repairs or replacements. This one-click solution allows you to fully rebuild the differential and may include a combination of ring and pinion, master installation kit, axle bearings and axle seals (depending on the application). Quick Kits save time, money and stress, and get vehicles off the lift and on the road quicker than ever.