1947 and 1948 had gas tank under the bed. 1947 & 1948 were almost the same truck. However, there were significant internal-differences in the engines and in the transmissions.
Doors with no vent window and a turn-down door-handle in 1947-50.
Doors with vent window and turn-down door-handle in 1951.
Doors with vent window and push-button door-handle in 1952-55.
Doors from any year may have been later placed on any year cab.
Last year of driver's-side cowl-vent was 1950 (no need for it, supposedly, when vent windows came in 1951).
Enclosed driveshaft torque-tube rear-ends/transmissions were standard on 1/2 ton trucks through 1954.
