If it's a mud bogger or 4wd truck, why not a Muncie SM420 4spd with low 1st, shouldn't be too hard to find 1. They put them in '60-'67 Chevy and GMC 4X4 trucks, deffinetly 3/4 ton, maby 1/2 tons. The trucks that had them had 4.56 gears. They have a PTO that comes out of the passanger side. They used variences of this trans up into the early '80's, in which some of the trucks had stock 454's.