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 - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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