Get your semi Ready for the Road Ahead with enhanced comfort, stability, and control, with the Dayton Parts Two-Stage Rear 4-Leaf Spring. With a layered design, this replacement component is able to provide additional support to the front, center, or rear of a vehicle, while absorbing shocks and minimizing vibrations. Crafted with a flexible body to decrease the chance of broken axles and bolts. FleetPride is your First Click in Heavy Duty .