i get it now. you are talking about a spring over axle (SOA) conversion. that will net you about 4-5 inches of lift. there is an easy superlift kit that will do this but it does it in a ghetto way. it works but if you really want to do it correctly you must cut of the spring perches and get new one welded on top of the axle. custom fabrication isnt cheap......
on the front, do you have a solid axle with coils or leaf springs? what kind of vehicle is this, as explorers have a ttb with coils and were never offered with a solid axle