11.25 inch Dana 80 4.88 Rear Ring and Pinion Install Kit 4.375 inch OD Head Bearing Yukon Gear & AxleYukon Gear & Axle 11. 25 inch Dana 80, 4. 88 Ratio Rear Ring and Pinion Gear Set and Master Install Kit Package Details: Rear Differential 11. 25 inch Dana 80 Gear Ratio 4. 88 Location Rear Structured Ring and Pinion Install Kit Over Drive 4. 375 inch Overdrive Head Bearing Warranty Warrantied against manufacturing defects for one (1) year Sold As Kit Features: For Applications with 10 Bolt Rear Cover and 12 Bolt Ring Gear Pro Kits feature the highest