Originally Posted by Subw00er
Having come from Vettes where this is normal, GM recommends a small bottle of the differential additive. Its gets rid of the problem.
Not at all to be recommended. The diff clutch pack is designed to operate with high levels of friction between the plates, putting additives into the diff oil may degrade the friction level such that the Limited Slip part of the Diff would no longer function correctly although it would at least be quiet.