Just starting to research this issue. Installed the ZL1 diff in my 13 SS. Having the same noises. Other than annoyance, is anything being "hurt" by it. I assumed it was just the clutches breaking in. Running Royal Purple FWIW.
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2013 Camaro 2SS/RS-6spd- Rally Yellow / AGP Twin Turbo
2015 Challenger Hellcat-6spd- Sublime
I think I see a trend here....
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