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I'd ask around the truck forums about using a transfer case. I think it causes a lot of drag. They also don't take kindly to being shifted while moving at a high rate of speed all the time.
You could just bolt the motor to a rear end that will net you a safe ratio (i.e. one that won't over-rev the motor if you go too fast), and there are also "2 speed" rear ends out there.
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