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Re: Disengaging from wheels to something else?
Many 4wd transfer boxes have a neutral position.
Pick one with an offset drive to front and rear axles (landrover LT230 is the one I'm most familiar with) so you can take a propellor shaft straight out the back PTO cover.
Put the transfer lever in neutral, your wheels stop driving but the PTO still runs at the output speed of your gearbox.
You probably want a clutch on the shaft to the propellor/water jet or whatever is providing water thrust so it's not turning when you're on the road.
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