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P.S. When you changed your gear lube did you use a solvent to flush the diff? If so, and some solvent was left in there it would break down the new lube prematurely. I only flush with new gear lube.
I have an Auburn Limited slip in my Z71 and it started to get noisey so I changed the oil and that quieted it back down. I used the oil that they had a dealership parts department. One bottle of gear oil to one bottle of GM limited slip oil.