Fabtech?s 6? 4 Link Conversion system for the Ford F450 and F550 Super Duty is built to handle the on and offroad demands of the truck enthusiast. 2? OD Heavy wall link arms have 1/4? thick steel brackets at the axle with adjustable alignment cams and Fabtech?s legendary 5 Ton joints to pivot at the frame for an extended service life. The 4 Link Arms attach to stout 1/4? thick steel frame brackets for a solid mounting of the new suspension. American made coil springs have been designed for a very compliant ride quality both on and offroad. 1/4? thick steel bracketry repositions the factory track bar to center the axle under the vehicle with the increased lift height. Super stout box style bracket is designed to eliminate deflection when the track bar moves through its full cycle. The Dropped Pitman Arm uses forged steel construction with high strength material that exceeds the factory specifications. Heavy duty 1/4" thick steel brackets control the travel eliminating over cycling of the suspension. Super strong construction can handle the full compression impact of the F450 or F550. 1/4" thick steel drop brackets reposition the front sway bar for the increased ride height. This allows the sway bar link ends to fully cycle without binding throughout the extended travel range. Brake Line Brackets reposition the factory brake lines down on the frame for the new travel range without having to open the brake system. Retains the factory F450 or F550 long travel steering stabilizer with a 1/4" thick steel bracket and support brace to help reduce tire shimmy. Steel rear lift blocks replaces the factory blocks for additional lift without changing the ride quality or load carrying capacity. American made U-Bolts designed to attach the entire rear differential to the vehicle. These extended length monotube Stealth shocks have a Nitrocarb piston rod for corrosion resistance and resist rock chipping. Great highway ride with good offroad damping capacity.