even at 3" you might need lower control arms, sway bar links, brake lines, shocks and trac bar to avoid problems.
31s can work on a stock height 4x4 MJ if you stick with Jeep rims (MJ/XJ/TJ/YJ/KJ) so if you're looking for a cheap lift, longer shackles (chevy drop shackles) and pucks up front can be your best bet.
If you want a 5" lift, save your cash and do it right the first time, don't make it a plan to bandaid a shorter lift kit. :thumbsup: