Bryce, those units have a spring to hold the shifter in low gear when parked, so when the diaphragm goes they won't shift into high. (NEVER park in high gear!)
The vacuum shift is simple and reliable, so I'd try to fix it rather than convert to electric. Of course if you can't get parts you can't fix it, so that might be your only alternative. I wouldn't waste my time trying to find a used shifter; replacing a fifty-year-old vacuum shifter with another fifty-year-old shifter probably won't turn out well.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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