im trying to lift my 1997 2500 8 lug suburban 4 inches and put 36 all terrains on it. i want to do a suspension lift. some questions 1.) do i need a add-a-leaf or new leaf springs? 3.) what are some links to good lifts and parts for the job ? 4.) would a lift suspension kit be a good idea? What kind of parts come in that? any other advice is welcome.