Traction Bars - Fixed | 4 Inch Axle | Dodge Ram 2500 (03-13) and 3500 (03-18) 4WDImprove traction on your 2003 2013 Ram 2500 or 2003 2018 Ram 3500 4WD (with 4 inch diameter axle tube) with a BDS Fixed length tubular traction bars. Fabricated from 1. 25 inch OD x 1 8 inch wall steel tubing with durometer specific polyurethane bushings on each end. BDS traction bars reduce rear pinion angle change commonly referred to as axle wrap during acceleration with these BDS heavy duty traction bars. Tubular design for good looks as well as