Fabtech 99-10 Ford F250/350 4WD Floating Rear Traction Bar SystemOur Traction Bars are designed to reduce rear leaf spring axle wrap caused by lift blocks and oversized tires. Typically the travel cycle of the Super Duty rear axle is an arch. Fabtech's exclusive traction bar shackle system allows the bars to float with the arched travel of the rear axle. This provides a non binding, smooth highway ride, while still providing positive resistance to torque loads, reducing axle wrap and increasing tire traction. This