Product updated on 2019-10-02, BellTech - BEL:643, 2007-13 Silverado/Sierra (Std Cab) 3 inch or 4 inch F/5 inch or 6 inch R drop W/O Shocks , Includes; 4955, 6521, 12464, 2511, 2007-13 Chevrolet Silverado/Sierra (Std Cab) 3 inch or 4 inch F/7 inch R drop W/O Shocks lowering kit, Belltech 643, Must use at least 17 inch wheels, includes spindles, coils, flip kit and shackles. Requires 8510 rear shocks not included in the price. Lowering the front of a 4wd more than 2 inches can cause premature drive axle wear and possible wheel alignment issues.