A Vietnam era Deuce and a half would have been an M35A1 or M35A2. The shop I ran back in the '70's changed out many engines and injector pumps in them. There apparently was a Canadian version tagged an M135, but I don't know about those. The M39 was a 5 ton.
Back in my college days in ROTC, I drove one that had a Hydromatic transmission in it. That was in the late '60s.
