Difference between 1947-1953 VS. 1954-1955 1st series truck Frame Rails.

Difference between 1947-1953 VS. 1954-1955 1st series truck Axle Bump stops .

The 1954-1955 1st series truck bed has a three inch increased in depth.
Therefore GM had to lower the frame rail arch height above rear axle.
You will not be able use the 1954-1955 1st series truck bed on a 1947-1953 frame.
You can but, top of the bed will not lineup correctly with the cab crease line.
Bed will ride High.

Cab mounting also changed somewhere between 1947 and 1955.

1954 Chevrolet 3105 Deluxe Panel Truck
w/Factory HYDRA-MATIC