All the 1/2 tons were 4.11. You will either have to find a floorboard with a hump for a 4 speed or cut an awfully big hole. Any particular reason for a 4 speed? 1st gear is almost worthless and reverse is terribly slow.
In this
thread he mentions wanting to go to a floor shifted transmission. As there seems to be no floor shifters for the torque tube 3 speed listed (I bet the later open style can be modified to fit), he's probably looking for other options.
I am in agreement, not much to be gained going with the SM420, the overall gear spread is terrible for a driver. A 3.11 Saginaw with the Patrick's conversion would be better, 4th will still be 1:1, though.
