With age and abuse rear springs can weaken and allow the rear of the vehicle to sag. NOTE: Before replacing springs you should first check the condition of the rubber center rear end mount and possibly replace the rear end subframe mounts. These are also causes of the rear end sagging.
Rubber spacers are installed on the top of these springs and come in three different thicknesses. Having the correct spacer can also help in setting proper ride height. See our rear spring rubber spacer selection elsewhere on our website.