Thread: Rear diff
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Old 12-21-2020, 01:19 PM   #3
getchapull
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Drives: 2019 ZL1 M6
Join Date: Aug 2018
Location: Republic of Texas
Posts: 160
Royal Purple Max Gear 75W-90 Synthetic Gear Oil is what I use and no groan.

https://royalpurpledirect.com/max-ge...etic-gear-oil/
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