Recurved leaf springs

So there's two ways to do this. The first and most common is a cold re-camber. This is where the spring pack is bent into the desired shape. If the bushings, leaf liners, etc aren't replaced you'll just have worn out springs bent to ride higher. The better way involves disassembling the spring pack, annealing the steel, re-cambering each leaf individually and then heat treating (tempering) before reassembly with new bushings, liners, clamps and hardware. This will give you basically new springs, but will probably cost as much or more then new replacements. Check with your local spring shop and see what they propose and compare costs.