Our exclusive Detroit Speed rear speed kits combine our individual products into a system designed for your vehicle. The Detroit Speed, Inc. Speed Kit 2 takes performance to the next level. With the Swivel-Links™ pinion angle and/or wheelbase can be adjusted without unbolting the link from the car.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