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I put mobil1 synthetic in the diff of my half ton suburban back in 2008 or 2009 and have not had any issues.
I will most likely put that same oil in the 10.5 inch 14 bolt diff on the C2500 I just picked up.
When changing the diff fluid I recommend putting the cheap stuff in there running around on it for a day or 2 then keep changing it every few days until it becomes clear. On that first change take something like WD40 (not brake cleaner) and spray out the bottom of the diff, that is where all the metal shavings and gunk are going to collect. If you clean the bottom of the diff it should only take one flush to get it cleaned out.
Also wear gloves and use safety glasses.
If the transmission looked like it was filled with used motor oil then the rear diff will likely look about the same or worse.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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