I tried doin a search on this topic because i was interested in doing it down the road. what do i need to do to swap my 3100 49 to a 4x4 napco truck. I remember reading somewhere that if i found a 50s napco it would be a straight bolt up (are the cab/bed mounts the same?). is this true if so what years would bolt right up. any input on the swap would be awsome thanks