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 GM 12 bolt truck 8.875 Inch Ring Gear Diameter 30 Spline Pinion 12 ring gear bolts 3.73 ratio 1 year warranty against Manufacturer defects Features and Benefits: Fits GM 12 bolt truck 8.875 Inch ring gear diameter 30 spline pinion 12 ring gear bolts 3.73 ratio Details: AAP_UDA_4: 70 Fitment Notes: GM 12 Bolt Truck Ring and Pinion Set 3.73 Ratio Fits 4 series 3.73 & Up Carrier Application Summary: 1963-1974 Chevrolet C10 Pickup (Rear) 1967-1974 Chevrolet G10 Van (Rear) 1963-1974 Chevrolet K10 Pickup (Rear) 1963-1966 Chevrolet Suburban (Rear) 1969-1987 Chevrolet Blazer (Rear) 1975-1986 Chevrolet K5 Blazer (Rear) 1975-1986 Chevrolet C10 (Rear) 1975-1981 Chevrolet G10 (Rear) 1975-1986 Chevrolet K10 (Rear) 1967-1986 Chevrolet K10 Suburban (Rear) 1987 Chevrolet R10 (Rear) 1987 Chevrolet V10 (Rear) 1987-1988 Chevrolet V10 Suburban (Rear) 1967-1974 GMC C15/C1500 Pickup (Rear) 1967-1974 GMC C15/C1500 Suburban (Rear) 1967-1974 GMC G15/G1500 Van (Rear) 1967-1974 GMC G25/G2500 Van (Rear) 1966-1974 GMC K15/K1500 Pickup (Rear) 1967-1974 GMC K15/K1500 Suburban (Rear) 1963-1966 GMC Suburban (Rear) 1979-1986 GMC C1500 (Rear) 1979-1986 GMC C1500 Suburban (Rear) 1979-1986 GMC K1500 (Rear) 1979-1985 GMC K1500 Suburban (Rear) 1987 GMC R1500 Suburban (Rear) 1987 GMC V1500 Suburban (Rear) 1975-1978 GMC C15 (Rear) 1975-1978 GMC C15 Suburban (Rear) 1975-1978 GMC G15 (Rear) 1964-1987 GMC G1500 (Rear) 1975-1978 GMC G25 (Rear) 1979-1981 GMC G2500 (Rear) 1975-1978 GMC K15 (Rear) 1975-1978 GMC K15 Suburban (Rear) 1987 GMC R1500 (Rear) 1987 GMC V1500 (Rear)