Detroit Speed Front 2 In. Drop Springs - PairGive your 1967 87 GM C10 C15 square body a perfect stance while improving ride and handling with our front coil springs. These springs feature a spring rate of 950lbs in with a free length of 11. 25" to give you a 2" drop in the front of your C10. We designed the drop springs to provide an improvement in both ride and handling over the soft factory coils. Replacement Front Springs for 1967 1987 C10 C15 Speed Kits 1 & 2 for Use with Small Block