i have an 89 xj and i have re3.5 front springs and a re lca over the winter i have bought a rear lockrite ,2 in coil spacers ,and i just ordered re 4.5 rear packs, i will be upgrading from 31x11.50 ssltb's to 34x10.5 ltb's ,if the vibes are to bad i will do a trans drop can you guys think of any thing else before i start ? oh and i am going to get new front shocks and build a shock mt for the rear at rthe bottom of the unifram rails