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Differantial assembly units can use ATF.
Millions of front wheel drive cars do it every day.
Most "open" spindle gear sets appear to do just fine in ATF, the GM zexel-torson LSD is approved for use with ATF. I don't see why detroit locker and varrious aftermarket lockers would have any problem.
Any spindle set with clutches such as a GM posi unit wont do so well with ATF.
The ring and pinion gears shouldn't really care what kind of oil they are in so long as they stay wet.
I think you could have problems if you put ATF in a differential used on applications other than light duty car stuff (I wouldn't mind being wrong on this).
It seems that on paper it should work but I have never found any one that has ever tried it.
Never try swapping ATF for gear oil in a manual transmission.
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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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