I have noticed that since I lifted my 97 s10 blazer that there is a slight clunk on the passenger side. I comes and goes but if you hit a bump or turn sharply at a higher speed you notice it. I assumed it was because my front end is out of alignment. I needed to replace my idler arm so I had the front jacked up and notice this, If you spin the passenger side tire it will spin almost 360 degrees but it stops. If you force it Thur the rough spot the whole differential and CV axle move up alittle and move toward the driver side a lot. Once you push through it clunks and is back to where it is supposed to be. I have had issues with the little inner shaft coming out of the differential with the CV axle when I had to replace the CV and when I was installing the lift kit. I dunno if that has anything to do with it and I am stumped. P.S. I hate I.F.S.