Jim,
Different names are used by different people (and sometimes by the same people).
First, I assume you are asking about the side doors.
There is a rubber seal that is glued to the edge of the door - this might be called the door weatherstrip.
There is a rubber seal that goes around the door opening in the cab - this is called the cab windlace and it slides in a track that runs from the floor on the dash side of the door opening to the floor on the rear side of the door opening. This track is spot/tack welded to the cab and is is somestimes rusted, bent, or partially missing).
Let me know if pictures will help (my server is down now, so I am unable to post pictures with this message).
Tim
