The mystery of where to find and replace the rubber door bumper cushions on 1934-46 GM trucks is solved by the following data:
During many restorations these bumpers are neglected or the owner doesn’t even know where these small units are hidden. They can not be seen unless the inner cab sheet metal panel at the rear door post is removed.
The purpose of these rubber bumpers are to cushion the door dove tail that has entered the receiver on the body post. (The dove tail is attached to the door and supports it when in the closed position.)
These bumpers are paired with small protective cups. The bumper gives the cushion to the door and the metal cups take the wear as the dove tail enters the cab post.
The old saying ‘a picture is worth a thousand words’ certainly applies here. The left cab rear door post in our example was removed from a very tired truck, however the dove tail mechanism was still good. Even the original Export Blue is still showing. The parts were carefully removed and some even cleaned of rust for better pictures.
Check the following data and pictures. They should help one even better understand GM’s heavy duty door support system.
Removable components of the door cushion system. The Metal cups will cover the smaller part of the rubber cushion.
The assembly as it sets in the cab post.
The inside of the cab post. Much of the assembly fits inside the small box which is welded in place. Note how the ears on the cups connect to the larger bracket. This is not visible in an assembled truck.
What you see on this cab post. These screws have been loosened prior to removal. Only the back side of the metal cups are visible.
The back side of the cab post. The inner sheet metal has been removed exposing the retaining screws. Several very small screw holes ( about 5″ apart) are visible where the sheet metal panel is secured.