um the t56 gears are at least as thick and actually have more teeth, thus more tooth contact. compared to a m-20 or 21 or even a 22, they are more heavy duty..... the 4500's are cast iron, and have slightly larger diameter gears....... it's probably more of a trade off --
Not sure I would trade a 4500 for a t56 in a 1 ton, but just saying the t56 is a rather stout trans and can handle a bunch of power.
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