Mark: First off it was an option with SA and SC after 1951. The first thing you need is a heavy duty clutch release bearing. That was an option from IH way back when. I have seen these units in operation, however I didn't take a close look. I do know these units had a short lifespan. If you look through a manual showing speeds and speed loss on pulling power these were very inefficient.
I don't remember the roller chain reduction Bob is suggesting you might use, however I think it is a good idea, as you will have difficulty finding a hydraulic motor with enough torque to power the tractor at that slow PTO speed. PTO speed is probably going to be less than 100 rpm to give tractor speeds you require.
I looked at building one of these at one time. I abandoned the idea as I figured it would be less cost to find a gear reduction that would fit in the torque tube. If such a unit is gear drive, it will actually increse draw bar pull. Bear in mind your PTO speed will reduce at same ratio as transmission, but you will be able to use it. You will also have full hydraulic function.
I might also add, I did a bit of searching for a planetary that could reduce final drive speeds at top shaft, or attach at the drive wheel. I also looked at building a heavy 3/4" plate box to replace cast extension between transmission and right final drive. Build that large enough to house a 4 speed transmission. It would slow tractor speed, however it would add to wear on differential gears. These ideas would not affect 540 PTO speed.
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