Spring shackle mounted anti-roll device and frame stiffener

A suspension system for the steering axle of a vehicle chassis provides anti-roll and frame stiffening properties. First and second leaf springs are provided aligned with longitudinal frame rails for a vehicle. An axle is attached to the middle portion of each of the first and second leaf springs with the axle being aligned transversely to the longitudinal frame rails. First and second shackle boxes depend from the longitudinal chassis frame rails aft of the axle and substantially adjacent the area of the longitudinal frame rails upon which the cab is supported. One end of each of the first and second leaf springs depends from one of the first and second shackle boxes. A bar is mounted transversely to the pair of longitudinal frame rails, connected between the first and second shackle boxes to resist vehicle roll and to stiffen the frame.