I would look to the world of "doodlebugs" for guidance here.
It was very common at one time for farmers to build tractors out of old cars/trucks. They would install multiple automotive transmissions, one after the other, to get the right gearing for field speeds while keeping the engine running fast enough to produce adequate power for the job.
You should be able to couple two or maybe three automotive style manual transmissions together and then find a gear combination that gives you the output RPM you're looking for.
The question is very vague, so I hope this is helpful.
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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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