SuperSprings Load Support for Rear Leaf-Spring Suspensions
SuperSprings are a self-adjusting suspension stabilizing system for vehicles with rear leaf springs. They supplement the existing suspension to help level carried loads and reduce body roll, making them a different solution from replacing worn shocks or adding a leaf inside the factory spring pack.
Support the suspension without rebuilding the spring pack
The system uses a semi-elliptical spring as an enhancement alongside the original leaf-spring assembly. It is not a conventional add-a-leaf or a replacement overload spring. Its purpose is added support and stabilization while preserving useful unloaded ride quality, rather than simply making the existing spring pack thicker.
Adjust preload with the shackles
Depending on the application, shackles have 1, 2, or 3 bolt holes. Higher hole positions increase preload so the system begins farther along its spring-rate curve. An installer can use those positions to accommodate uneven loading—for example, more preload on the crane side of a work truck than on the opposite side.
Steel construction and application-specific installation
SuperSprings use SAE 5160H steel in a supplemental semi-elliptical arrangement. Installation does not require dismantling the factory leaf pack. Follow the exact application’s mounting instructions and select the appropriate brackets or installation tools; access and existing suspension condition determine the work required.
Leveling does not increase GVWR
A level-looking truck can still be overloaded. Supplemental spring support does not change Gross Vehicle Weight Rating, axle ratings, tire limits or the towing rating. Calculate the working load with occupants and equipment included, and repair damaged original springs rather than using added preload to hide a fault.
Related reading
Frequently asked questions
Can SuperSprings compensate for an uneven permanent load?
Adjustable shackle positions allow different preload settings, including side-to-side adjustments for an installation such as a crane truck.
Do they increase the truck’s legal carrying rating?
No. They provide supplemental support but do not increase the manufacturer’s GVWR.
