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Ok Frank, I read your post and felt pretty stupid. Why I didn't I think of that? My 720 operators manual doesn't cover this and we don't have one for the 80 as of yet. Since the 4 - 16" bottoms cover 64", I am assuming that the center of draft is around 32" from the outside edge of the leading bottom. If this assumption is correct, then you would need 32" from the center of the drawbar to the inside edge of the tractor tire. The wheels on the 80 don't allow much for adjustment, just 2 positions. I haven't measured yet, but I believe that the 32" dimension to inside of tire is close to where the wheels are set. If additional adjustment is needed, would you just move the drawbar? I don't think that 3" either way would upset the way an 80 pulled a 4 bottom plow. I have done a lot of things with a farm tractor and nearly everything that can be done with construction equipment, but plowing is not one of them. By the time I was old enough to help on the farm, chisel plows, heavy disks and/or no-till was the way of the world. My uncle used to do some plowing with his 4320, but that was with a semi-mount(6-16") and hydraulic hillside hitch. You have much more room for error on the setup with that hillside hitch as I believe it moves 5 or 6" either way.
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