Compatible with 1963-1969 Chevy/GMC C/K Series Pickup & Blazer/Jimmy/Suburban;Complete kit including limited slip differential to make intallation a breeze; Heat treated high quality 1541H alloy for strength and durability; 30 Spline and 30-3/4" long for a direct replacement; 5 x 5" lug pattern; Fits 8.875" GM Truck 12 Bolt;