Well I put the 2" spacer lift on the TJ the other day..and guess what.. slight driveline vibration.. sheesh you would'nt think the 1 3/4" effective lift would be that big a deal.. sure surprised me. Also Pro-comp is a pain in the butt.. I got this "spacer lift" from them.. 4 poly spacers all the same.. but what they dont say in the instructions or anywhere else.. is that you have to buy the extended bump stop cups.. not just the stops. cause the spacer takes up all of the rear cup and the spring just sits there on the flat side of the spacer.. the guy at "Tech support" says.. well we do offer a m ore complete kit..for 899.00 "for 2" of lift?? Are they nuts..?"