Maybe I'm thinking wrong not seeing the parts first hand but looks like maybe if they made the elwood shifter gear wider and it was shifted out of front drive, then when transmission was shifted to 5 the 4th gear would mesh with elwood and put it back in 4 wheel drive. There would be no 2 wheel drive 5th gear. Never saw the inside of one but a M only used gears 1 through 3 also. Did you notice if 4th gear on top shaft was 33 or 35 teeth? If it came with the 35 the gear box would mesh with 4th gear on a SMTA through 450, 560 also if it has the slow 4th. But as you said the planetary gears would through it off. I wonder if elwood used different gear ratios in the front axle when switching to tractors without planetary.
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