look if your jimmy is 4x4 then you need to get new keys for your torsion bars and get 4 inch lowering blocks for the rear. do not get 3 you will not be happy. i lowered mine 3 in the rear and hated it. i have a 2000 4x4 and i lowered it 3 up front and 4 in the back. once you get the new keys you can fine tune it with the adjustment bolt that holds it in place. you will have to get shock for a lowered truck and new bump stops. go to stylin trucks they have the keys, blocks and shocks. you can get the bushings at autozone. send me your email address and i will send you some photos of mine so you will have an idea of how it will look.