SHIFT LEVER STUCK IN PARK/ DIFFICULT TO SHIFT(REPL. TRAN)

REVISION 09/24/93

THIS BULLETIN IS BEING REVISED TO CHANGE THE CAUSE.

SUBJECT: SHIFT LEVER STUCK IN PARK/DIFFICULT TO SHIFT (REPLACE TRANSMISSION)

MODELS: 1991-92 P TRUCKS (EQUIPPED WITH 7.4L (L19) ENGINE)

TRANSMISSION APPLICATIONS:

1991-92 HYDRA-MATIC 4L80-E/4L80-EHD SRTA UNITS (MT1)

TRANSMISSION MODELS:

DPP

CONDITION:

SOME HYDRA-MATIC 4L80-E/4L80-EHD SRTA TRANSMISSIONS BUILT BETWEEN MAY 5, 1992 THROUGH SEPTEMBER 29, 1992 (8687902 MODEL 1DPP SERIAL NUMBERS 6093-11015 AND 8687927 MODEL 2DPP SERIAL NUMBERS 11725-12493) AND SHIPPED TO GMSPO MAY EXHIBIT THE SHIFT LEVER STUCK IN PARK OR DIFFICULT TO SHIFT. VEHICLES SERVICED WITH THE ABOVE TRANSMISSIONS MAY EXHIBIT THIS CONDITION.

CAUSE:

THESE TRANSMISSIONS WERE ASSEMBLED WITH A PARKING LOCK PAWL WHICH IS NOT INTENDED FOR USE ON P TRUCK APPLICATIONS RATED 16,000 POUNDS GVW. THOSE VEHICLES ARE EQUIPPED WITH AN AUTOMATIC APPLY DRUM BRAKE PARK SYSTEM ON THE DRIVE TRAIN TO RETAIN THE VEHICLE. THE DRUM BRAKE IS THE ONLY PARK MECHANSIM DESIGNED FOR THIS SPECIFIC GVW.

CORRECTION:

REPLACE UNIT WITH A SRTA (SERVICE REPLACEMENT TRANSMISSION ASSEMBLY).

FIGURES: 1

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER." THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS OCCURRING 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 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.

COPYRIGHT 1993, GM POWERTRAIN DIVISION. GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.