I have a 1951 1 Ton Canadian GMC (Chevrolet) and a 1938 Chevrolet Master, which is a sedan. They both have 216s in them. The 1 Ton now has 410 rearend gears and the Master has 422 gears. The 1 Ton gets excellent mileage, almost twice that of the Master. Oh and the 1 Ton is about 900 pounds heavier. I seem to remember years ago that mileage was not consistent vehicle to vehicle, even with the same model.
