Our Speed kits are designed to make your A-Body maintain optimum geometry and tire contact through the full range of rear suspension travel. Through the use of our patented Swivel-Links™, the rear end housing becomes fully articulated, without the use of noisy spherical heim joints. With the Swivel-Links™ pinion angle and/or wheelbase can be adjusted without unbolting the link from the car. Our rear Speed Kits are designed to complement the front Detroit Speed Kits, giving your classic contemporary handling and ride quality on par with the latest modern muscle cars.