probably depends on tooth length and profile in the box... although when you look at the parts for ford trucks cars and tractors you'd be hard pushed to see much difference
they, seem to have followed the same path as mopar and GM... either used or copied saginaw.
they all look like saginaw 525 boxes just varied dimensions one way or another
all just 1 circuit or 2 circuit (balls) variations on this
dave
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