Leaf spring helpers assist sagging and overloaded leaf springs in maintaining ride height. Over time, leaf springs can stretch and flatten, providing less support than they did from the factory. Adding leaf spring helpers to your current leaf spring can help level your vehicle when it's under load, and also makes your vehicle safer to operate. With a heavy load, the rear end of the vehicle can sag, putting pressure on the rear suspension and lightening the load on the front. This can make the vehicle difficult to control. Adding a leaf spring helper may also help save your suspension from early wear and tear. For leaf spring parts for your car, truck, or SUV, check out O'Reilly Auto Parts. We carry a full line of suspension parts for a complete repair.