I am not a shill for Amsoil in any way. But when I had issues-mainly noise, going all the way back to a 1992 Blazer, Amsoil cured the problem WITHOUT ever using limited slip additive. I'd probably use what GM recommends for a Camaro. New fluid in diffs AND trans can sometimes cure a lot of ills.
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“I don’t want to belong to any club that would have me as a member.” - Groucho Marx
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