I have a 93 with a Rancho 4" lift that is 14 years old. Reasonably, the rear end has started to sag a bit and I hate the way the truck looks. Pre-runner style is ok for pick-ups but not Broncos (in my opinion). My question is this...Do I replace the springs with new ones? I don't it to sit "stink bug" either! The local spring shop said they could re-arch and add an add-a-leaf (for integrity) for about $115 a side if I did the measuring and bring the spring packs to them ($390 if I drop the truck off). Will an add-a-leaf allow for as much flex? Should I re-spring the whole truck? Is there a better way to go?