Our exclusive Detroit Speed A-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, each speed kit is for your driving needs with the ease of a bolt-on package. Speed Kit 1 is designed to bring your classic GM muscle car into the 21st century with improvements in ride, handling, and camber/caster correction. Speed Kit 2 takes performance to the next level with coilover shocks and springs that provide ride height adjustment.Double Adjustable Shock:This is the most race winning shock JRi has in its stable. With its two independent adjustments and the enormous range of adjustment it can be set to the exacting demands of the driver and performance levels required while providing excellent ride quality on the street.Spring Rate: 550lbs/inSpring Free Length: 9.5in