Door trim panel warpage has been reported on some 1985-86 C/K models just above the carpet at the lower edge of the door trim panel (See Figure No.1).
To repair this condition, a new seal (P/N 363139) has been released. This seal should be installed as shown in Figure No. 2.
Beginning with the following VIN breakpoints, this new seal was incorporated in production.
Chevrolet GMC GF388968 GF721427 GF167152 GF520199 GJ156681 GJ521709 GS165327 GS521732 G1153422 G1518116
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.