How's your front pinion angle?
I ask, because I just finished a 4.5" lift, and the "recommended" LCA angle was junk- I've had to adjust a few more times, just to get the front angle right. In the meantime, I trashed my front u-joint, because it rotates even thought I'm not in 4wd. I have the non-vaccuum axle.
If you have major noises, then I'd be prone to suspect that your front angle is fubar- try removing the front DS for a little while. Go and buy a new u-joint and put things back together carefully. I have adjustable LCA's, so I had to use a pipe-wrench and a floor jack to keep the front driveshaft from shifting when I was adjusting the front LCA's, but after a few "pull-in's", I finally found the happy medium between correct castor and pinion angle. Big Suprise, it didn't even closely match what the manufacturer recommended...
Rule of thumb I learned here, Pinion angle takes precedence over castor angle- which means that you're shooting for 6-7* of angle on castor. If that doesn't meet your needs in mating to your lift and pinion angle, then adjust to meet the "best possible" pinion angle, otherwise you'll be replacing U-Joints every other weekend, when the front end is in "use".
A cheap dregee scale, and a WHOLE LOT of patience is required. DO NOT get frustrated, and don't ignore the important noises- the truck is telling you what it wants, regardless of what others tell you- if you hear noises, then something is not right, and requires more study on YOUR part. Things get (or ARE) loose, and require your attention before more troubleshooting takes place.
The pinion should be pointed TOWARD the driveshaft, and that is the "perfect match" there. The rear is a different story, and requires it's OWN adjustment procedures- please look deeply into the "search" function, and weigh each opinion for what the writer is trying to tell you. I learned a lot there, but I don't nessesarily agree with EVERYTHING I read there.
No 2 Jeeps are the same- even from the very same make, model, and production line run list. My best friend and I have "identical" models, only 300 units different, but our lifts have required vastly different adjustments to make the very same modifications work.
Read, and experiment. Sorry if that sounds like a lame statement, but there's LOTS to learn here. Keep searching, and reading. I know it sounds lame, but I've read WAY too many posts of people who lifted like I did, and had "No issues, whatsoever".
As IF...