I can't answer any of your questions, but I would like to add a little information.
Certain Oliver tractors had, as an option, the Thomas variable drive unit. This was in the 1940's and 50's model 60, 66 and 77 standard and industrial tractors.
Several years ago I was in contact with a man in ND that had a 60 industrial with one, and I sent him a copy of the information I had. I didn't stay in touch with him to know what he did with the tractor.
Oliver also used that unit in their model 40 self propelled combines.
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Today's Featured Article - Ford Super Dexta - by Anthony West. The rusty blue tractor caught my eye as my truck zipped by the farm implement business. It looked so fornlorn amongst the lineup of newer equipment. But it was just the right size for my small farm. I stopped in and asked the proprietor for further information. "It's a 64 Ford Super Dexta", he said. "It's a tough little tractor, although it's a hard starter being a diesel and all." He did manage to get it running, compliments of a can of ether. Once started it putted along pretty good. It
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