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My Hydro-Gear has a 19.2: 1 gear ratio. With 18" diameter tires the top speed would be 8 mph if used as direct drive (1:1). Is there any reason this shouldn't work?
I would place an oil cooler for each side in the hydraulic lines, as these things heat up quickly when being worked. It should work just fine, and if that speed doesn't bother you as not fast enough, you should be ok. Build it.