I've had my '53 3-ton on the highway and while it do very well, I didn't feel comfortable taking it above 75km/45mph. I want to stick to the old stovebolt engine and not interested in a transmission swap (changing the clutch was enough work). Those old overdrive units are rare and new ones are expensive. This leaves me with only one option. I have heard of people changing the gears in differentials, but never in a 2-speed. Is it possible?
