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Been using ATF in a 1967 4 speed manual Ford for years now. Originally had some heavy oil, might have been as much as 140W. It was getting very hard to shift into 2nd gear. Used to be fine, but then the shift to 2nd became stiff when the car was cold. Got worse, so that 2nd was hard to shift into when warmed up, and almost impossible when cold. Was taking serious force on the gear shift to get it in 2nd.
We switched to ATF, and 2nd gear has been fine ever since. Not sure how many miles we have put on it since switching, but at least 20k.
One thing about differential oil: has to be specially formulated for hypoid gears. Lot of pressure on those. ATF won't cut it.
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