you didn't mention if you put in the shims that came with the kit (a 4" lift should have come with shims).
put in the lowering kit and use the shims to get your angles right. plenty of people have put in 4 inch lifts without cv shafts and had no problems at all. if it's already clicking you should replace the u joints now.
it's easier now then later. and if you have those crappy straps on the u-joints you might want to replace them with ubolts. i was going through joints every six months till somebody told me to switch to the u bolts( i got good at replacing u-joints tho)
good luck
Brian <img src="/forums/images/graemlins/smile.gif" alt="" />