AUTO TRANS. SHINE NOISE AND /OR ERRATIC SHIFT (REP. DIP. GMC Truck GMC MD Conventional (C Model) 1991

SUBJECT: AUTOMATIC TRANSMISSION WHINE NOISE AND/OR ERRATIC SHIFTING (REPLACE TRANSMISSION DIPSTICK)

MODELS: 1990-97 CHEVROLET AND GMC C6H, C7H MEDIUM DUTY TRUCKS WITH ALLISON MT643 AND MT653 AUTOMATIC TRANSMISSIONS (RPOS ME4/ME6) BUILT PRIOR TO VIN BREAKPOINT: CHEVROLET VJ114793 GMC VJ518402

CONDITION:

SOME CUSTOMERS MAY REPORT AN AUTOMATIC TRANSMISSION WHINE NOISE AND/OR ERRATIC SHIFTING.

CAUSE:

THE AUTOMATIC TRANSMISSION DIPSTICK, P/N 15676451, IS MIS-CALIBRATED. THIS RESULTS IN A TRANSMISSION FLUID UNDERFILL CONDITION.

CORRECTION:

REPLACE THE DIPSTICK USING THE PART NUMBER LISTED BELOW.

PART INFORMATION P/N DESCRIPTION QTY 15008570 DIPSTICK 1

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME K6130 DIPSTICK - REPLACE 0.2 HR

IMPORTANT: LABOR OPERATION IS CODED TO BASE VEHICLE COVERAGE IN THE WARRANTY SYSTEM.

FIGURES: 00 ATTACHMENTS: 00

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.