Here is my guess... what's the max speed for the farmall M? something on the order of 1800 rpms?? if so, putting a 2100 rpm 450 engine in a farmall M might mean that the 540 rpm pto will be exceeded when going 2100 rpm. The 450 was geared so that full power at 2100 rpm occured at 540 rpms?
I don't really know the max rpms of both tractors, but that's my point, max engine speed for power take off could vary.
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