USA Standard ring and pinion sets are the right choice to add confidence to your install. USA Standard Gear offers a full line of ring and pinion sets for a variety of common and hard to find applications. Fits reverse rotation Dana Spicer 60 9.75 Inch Ring Gear Diameter 29 Spline Pinion 12 ring gear bolts 4.88 ratio 1 year warranty against Manufacturer defects Features and Benefits: Fits reverse rotation Dana Spicer 60 9.75 Inch ring gear diameter 29 spline pinion 12 ring gear bolts 4.88 ratio Details: AAP_UDA_4: 70 Fitment Notes: Dana 60; Reverse Rotation; 4.88 Ratio; Thin; Fits 4.56 Case Dana Super 60; 4.88 Ratio; Thin; Fits 4.56 Case Application Summary: 1978-1999 Ford F-250 (Front) (Drive: 4WD / Note: Dana 60 Reverse Rotation 4.88 Ratio Thin Fits 4.56 Case) 1999-2015 Ford F-250 Super Duty (Front) (Drive: 4WD / Note: Dana 60 Reverse Rotation 4.88 Ratio Thin Fits 4.56 Case, Dana Super 60 4.88 Ratio Thin Fits 4.56 Case) 1979-1997 Ford F-350 (Front) (Drive: 4WD / Note: Dana 60 Reverse Rotation 4.88 Ratio Thin Fits 4.56 Case) 1999-2015 Ford F-350 Super Duty (Front) (Drive: 4WD / Note: Dana 60 Reverse Rotation 4.88 Ratio Thin Fits 4.56 Case, Dana Super 60 4.88 Ratio Thin Fits 4.56 Case) 2000-2014 Ford F-450 Super Duty (Front) (Drive: 4 X 4 / Note: Dana 60 Reverse Rotation 4.88 Ratio Thin Fits 4.56 Case, Dana Super 60 4.88 Ratio Thin Fits 4.56 Case) 2000-2013 Ford F-550 Super Duty (Front) (Drive: 4 X 4 / Note: Dana 60 Reverse Rotation 4.88 Ratio Thin Fits 4.56 Case, Dana Super 60 4.88 Ratio Thin Fits 4.56 Case)