Whatever you do, don't do it on pavement. My bus is a 1800 international, and I snapped a driveshaft pulling on pavement.
Deuce has 6.00 first, 2 to 1 low range, and a 6.72 axle. That would be a total reduction of 90.3 to 1
Grain truck, 7.00 first, 2 to 1 2-speed rear end(guessing here)...