You don't have much to worry about w/ a 5.5 inch suspension lift if you get a good, complete kit from one of the venders mentioned above, other than extending break lines, e brake cable, drive shafts. 5.5 inch is a pretty big change. If I were you, and was about 6 months ago, I would look closely at the difference between 3.5 in versus 5.5 in lift kits and 33 inch tires versus 35 inch tires. Look at the different combos and do the one you really want, the first time. Personally I did 3.5 in w/ 33 inch tires and am completely satisfied. However I'm just an off roader, not a rock crawler.