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.Base Shock:The DSE/JRI 'Detroit Tuned' base shock is a 'pure blood pedigree' racing shock in its most efficient form as a non-adjustable unit. Although non-adjustable, it shares all the increased dynamic responses of all the JRI adjustable models while providing excellent ride quality on the street.Spring Rate: 275lbs/inSpring Free Length: 10in