The DSE Speed Kit 1 is designed to lower the ride height of your 1967-1972 GM C10 truck by 5 to 6-inches in the rear. The Speed Kit 1 features lowering springs, lowering shocks, frame notch, and track bar/shock relocation for a complete rear lowering solution. Detroit Speed coil springs lower your truck by 5.5-inches while improving the ride quality and handling. Lowering shocks and relocation improve the shocks' ability to control the rear axle. The unique frame notch bracket provides the necessary clearance when lowering your truck and improves chassis rigidity. The adjustable track bar, featuring dual-axis pivot bushings, is relocated to improve stability and allow centering of the rear axle after lowering.