The Detroit Speed Drop Spindle Kit improves the handling and performance of your 1971-1972 Chevrolet/GMC C10/C15 Truck while lowering the front ride height by 2.50-inch The drop spindle kit includes forged aluminum drop spindles with forged steel steering arms, ball joints, tie-rod ends, and tie-rod adjusters. The uprights feature truck hub pack wheel bearings with a dual bolt pattern (5x5-inch or 5x4.75-inch). The hub bearings use OE-style GMT800 (1999-2006) Silverado brake design, allowing stock or aftermarket brake options.