INFO. ON NEW VARIABLE PRESSURE CONTROL SOLENOID ASSEMBLY

REVISION: 05/10/94

THIS BULLETIN IS BEING REVISED TO CORRECT YEAR UNDER PARTS INFORMATION PARAGRAPH. PLEASE DISCARD CORPORATE BULLETIN #477109. ----------------------------------------------------------------------

SUBJECT: INFORMATION ON NEW VARIABLE PRESSURE CONTROL SOLENOID ASSEMBLY

MODELS: 1991-94 CHEVROLET AND GMC TRUCK C/K, P TRUCKS, SUBURBAN AND G VAN

TRANSMISSION APPLICATIONS:

1991-1994 HYDRA-MATIC 4L80-E/4L80-EHD (MT1)

BEGINNING WITH 1994 MODEL START OF PRODUCTION (SOP), ALL HYDRA-MATIC 4L80-E/4L80-EHD TRANSMISSIONS ARE BEING BUILT WITH A HOLLEY VARIABLE PRESSURE CONTROL SOLENOID (PCS). BECAUSE OF DIFFERENCES IN THE ELECTRONIC CALIBRATIONS, THE HOLLEY AND THE BOSCH VARIABLE PRESSURE CONTROL SOLENOIDS ARE NOT INTERCHANGEABLE.

WHEN SERVICING A VARIABLE PRESSURE CONTROL SOLENOID (PCS), IT MUST BE REPLACED WITH THE SAME BRAND AS THE ORIGINAL.

PARTS INFORMATION:

8684216 VARIABLE PRESSURE CONTROL SOLENOID (HOLLEY 1994) 8677314 VARIABLE PRESSURE CONTROL SOLENOID (BOSCH 1991-1993)

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

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 1994. GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.