Fabtech's Radius Arm system for the Ford Super Duty is built to handle the on and offroad demands of the truck enthusiast. This system is a complete upgrade to the factory suspension and will provide additional strength for use with oversized tires. The heart of this quality system is Fabtech's tubular Radius Arms. The design of these arms comes from Fabtech race components built with a tubular structure reinforced by a dimple die side plate and heavy gusseting for rugged offroad use. They are an outstanding upgrade to the stock stamped arms. This Radius Arm design has been proven in over 10 years of service in military applications. High quality components with properly designed suspension geometry is what sets this system apart from all other Radius Arm suspensions. System includes a free 5 year 60,000 mile powertrain warranty. Include with this system is Dirt Logic 2.25 Stainless Steel reservoir shocks in the front and non reservoir shocks in the rear. These Dirt Logic shocks have been ride tuned to the vehicle with the Fabtech Coil Springs and oversized tires for an excellent ride quality both on and offroad. Each Fabtech component has been designed with specific features and benefits that create this quality suspension system.