SHAKING SENSATION WHEN VEH. IS OPERATED BETWEEN 35-55 MPH. Buick Regal (China) (CNG) 1999

SUBJECT: SHAKING SENSATION WHEN VEHICLE IS OPERATED BETWEEN 35-55 MPH (55-90 KM/H) ON SMOOTH ROADS WITH CURVES OR DIPS (REPLACE TRANSMISSION MOUNT)

MODELS: 1997-99 BUICK CENTURY, REGAL

CONDITION:

SOME CUSTOMERS MAY COMMENT ABOUT A SHAKING SENSATION WHEN THE VEHICLE IS OPERATED BETWEEN 35-55 MPH (55-90 KM/H) ON A SMOOTH ROAD SURFACE WITH CURVES OR DIPS. THIS CONDITION MAY BE FURTHER AGGRAVATED BY ELEVATED AMBIENT TEMPERATURES.

CAUSE:

THIS CONDITION MAY BE CAUSED BY THE VEHICLE'S ENGINE BEING VERTICALLY DISPLACED OR BOUNCED IN ITS' MOUNTS, RESULTING IN THE TRANSMITTING OF A VIBRATION INTO THE BODY STRUCTURE.

CORRECTION:

REPLACE EXISTING ELASTROMERIC TRANSMISSION MOUNT WITH HYDRAULIC TRANSMISSION MOUNT (P/N 22178939), FOLLOWING APPLICABLE SERVICE MANUAL PROCEDURES.

IMPORTANT:

TRANSMISSION MOUNT (P/N 22178939) SHOULD NOT BE INSTALLED IN AN ATTEMPT TO CORRECT ANY CONDITION OTHER THAN THE VIBRATION DESCRIBED ABOVE.

PARTS INFORMATION:

P/N DESCRIPTION ================ ================================

22178939 TRANSMISSION MOUNT

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLE REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION LABOR OPERATION NUMBER DESCRIPTION TIME =============== ================================ ===============

K6721 MOUNT, TRANSAXLE - REPLACE 0.8 HR

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.