I have a 3rd generation chevy dually dump but the cab/front clip is shot, how difficult is it to put a 4th generation cab/front clip on it? I'm not too concerned about body mounts, or engine electronics or fuel delivery (carb vs injection) My biggest concern is can I get the G4 steering column to work with the G3 frame? Although now that I think about it, are the frame rails different widths? Thanks.