SMU - SEC. 7 - AUTOMATIC TRANS - REV. SHARTS. GMC Truck GMC K Pickup

SUBJECT: SERVICE MANUAL UPDATE - SECTION 7 - AUTOMATIC TRANSMISSION REVISED CHARTS (GENERAL SPECIFICATION SECTION)

MODELS: 1998 CHEVROLET AND GMC C/K MODELS WITH HYDRA-MATIC 4L80E TRANSMISSION (RPO MT1)

THIS BULLETIN UPDATES THE 1998 C/K TRUCK AUTOMATIC TRANSMISSION 4L80E GENERAL SPECIFICATION SECTION. THE SHIFT SPEED CHART AND THE RANGE SIGNAL CHART WERE OMITTED FROM THE SERVICE MANUAL. THE 1-2 SHIFT SOLENOID VALVE STATE IS CORRECTED TO INDICATE "ON" ON THE OVERDRIVE RANGE FOURTH GEAR CHART. MAKE A NOTE OF THE LISTED CHANGES IN YOUR SERVICE MANUAL.

FIGURES: 00 ATTACHMENTS: 02

Object Number: 336280 Size: FS

Object Number: 336282 Size: FS

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.