Thanks guys I am going to look into it. Have no experience with diffs other than fluid services. Or one exploding and a swap from customers having a leak and never fixing it. Lol

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k