Mike
I suspect the American pumps were pretty standardised as I have fitted CMP pumps to Dodges OK (I know the Ford and Dodge gearbox are very similar.)
They all appear to have an SAE standard bolt pattern on the boxes for power take-offs. I have seen power take-offs on the same gearbox attachment for winches, bag lifters, tipper drives and hydraulic pumps. As you say there could well have been gear variations.
I think I might prefer the modern precision made Chevrolet alloy pump over the 19th century sand cast Morris iron effort. The CMP cast iron pumps are still much prettier than the English version. Suppose it does not matter as I mentioned before, the hours of use of any off them would last a hundred years - if you did not drive off with them engaged!
Lang
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