I would be much more comfortable using a 70w80 weight MT oil in a diff compared to something possibly way too thin like ATF or GM synchro oil.
If I ever decide to swap out my GM 10 bolt rear in my camaro for something else I will be sure to fill it with ATF and drive it for a while just to see what happens.
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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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