This is technically the wrong section, but for a homebrew lift you could try to get some bigger/stiffer springs from a bronco or something. I heard they ride rough though. It only gains a couple inches also. You can also try putting spacers on also. Im not familiar with ZJs but Im assuming from off the top of my head that the rear is done similar to the front. So Id guess you just need longer springs and shocks to go with it, maybe brake lines or relocation brackets. Maybe someone with more knowledge about ZJs will chime in.