11.25 Inch Dana 80 3.73 Rear Ring & Pinion, Install Kit, 4.375 Inch Od Head Bearing USA Standard GearUSA Standard 11. 25 inch Dana 80, 3. 73 Ratio Rear Ring and Pinion Gear Set and Master Install Kit Package Details: Rear Differential 11. 25 inch Dana 80 Gear Ratio 3. 73 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: This particular kit contains a 3. 73 Ring and Pinion Gear Set For Applications with 10 Bolt Rear