Our exclusive Detroit Speed G-Body Speed Kits are designed to work as an integrated system on your vehicle. By utilizing our proven Detroit Speed components and carefully selecting components designed to complement each other, the speed kits are made for your driving needs with the ease of a bolt-on package. These Speed Kits are designed to bring your classic GM muscle car into the 21st century with improvements in ride, handling, and camber/caster correction.Spring Rate: 575lbs/inSpring Free Length: 9.5in