− Decrease quantity for Lowering Kit, Coil Springs, 3-4 in. Front, 7 in. Rear, GM, Silverado, Sierra, Extended/Crew Cab, Kit Quantity + Increase quantity for Lowering Kit, Coil Springs, 3-4 in. Front, 7 in. Rear, GM, Silverado, Sierra, Extended/Crew Cab, Kit Add to cart