the oil specified is very specific, the oil that can be used is not.
I have run my gearboxes on Dexron without problems for years.
After all this is the same box manufacturer as the one supplying numerous other cars, and Mazda and Nissans with Auto boxes.
Could be differential or box. If relating to car speed, irrespective of gear - diff, if related to revs of the engine - gearbox itself.
I would guess something wrongly assembled or touching, provided the filling is correct.
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