how much lift are you wanting? on a zj, much over 3.5-4 inches starts needing longarms to act right. for height purposes, there isn't much difference between I6 and V8 springs-that 4.0 is heavy. if 3 inches will work for you, look into a front to rear swap(use front coils in rear, then buy new front lift coils). this works ok with factory short arms, but fully boxed arms are better. the track bars will be at the limit for stock ones, adjustable would be better, but you can re-drill the lower bolt hole in front to compensate. for the back, try to stay away from the bracket extensions for the top mount unless they offer extra reinforcement-the unibody rail has a tendency to crack wit the extra leverage. on mine, I cut & sectioned it & welded a puck in the rear track bar to make it longer after much measurement to make sure I got it right the first time. this is not necessarily recommended, I used a whole lot of amps on the welder to make sure it had enough penetration for strength-only do this if you're sure of your measurements and welding ability. also take into account the front swaybar links, I made my own after destroying a couple off the shelf sets.