Definitely NOT the slipper if you've torqued it down. I have found that tightening the diffs works most of the time however, you may also replace the spring used in the diff from time to time since I have found it to weaken with a lot of heat build-up. I have a high power set-up and it seems I am constantly shredding my diffs. Solution: use less power. I won't....but hey, now I am an expert diff builder.
