I don't see how AC will make a differnce. My 4" lift came with adjustable upper and lower control arms, front track bar, rear track bar relocation bracket, extended bump stops and sway bar links, t-case drop, new springs o'corse, dropped pitman arm, steering stabilzier, longer shocks. Prolly going to need extended break lines. I went ahead and installed a SYE and new drivehshaft so i didn't need to use the t-case drop, but its prolly not needed for a 4" lift, but a good idea if ya got the extra money to spend.
I don't think i'm missing anything....