Our exclusive Detroit Speed Complete QUADRALink Rear Suspension Kits combine our individual products into a system designed for your vehicle. The Detroit Speed Kit 1 provides the ease of bolt-on components to improve your 1982-1992 Camaro/Firebird. The Speed Kit 2 takes performance to the next level while the Complete QUADRALink Rear Suspension Kit is the most advanced system you can purchase for your 1982-1992 Camaro/Firebird.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: 275lbs/inSpring Free Length: 10in