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The best atf for a 4sp auto is whatever is on special.
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Ok if you wish but certainly never on my car. Just Google "the importance of using the correct fluid in your automatic transmission" to see how wrong you are. e.g.
https://advancedtransmission.com/wha...-transmission/
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In fact, if there's a problem or it's worn out, the best thing is actually the oil still in it.
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That's actually been proven to be myth with post 1980 vehicles. But you aren't the only one with this view per
https://www.reddit.com/r/AskMechanic...uid/?rdt=63434 But you certainly don't machine flush an old (or even a new) transmision with solenoid valves as you risk moving friction material and other contaminates from the sump into these solenoid valve damaging them; perhaps this it what keeps this myth alive.
If other ATF were suitable Ford would certainly not specify it for use for the BTR in the FG given they were at the same time selling other vehicles that use Dexron etc and it would have been cheaper and more convenient for Ford to use one of those for servicing the BTR as that they would have had that ATF readily on hand in bulk.