MUFFLED CLATTER TYPE NOISE COMING FROM CENTER OF PASS.. Chevrolet Corvette 1998

SUBJECT: MUFFLED CLATTER TYPE NOISE COMING FROM CENTER OF PASSENGER COMPARTMENT (REPLACE TRANSMISSION MOUNT ASSEMBLY)

MODELS: 1997-98 CHEVROLET CORVETTE - BUILT PRIOR TO VIN BREAKPOINT W5120351

CONDITION:

SOME CUSTOMERS MAY COMMENT ABOUT A MUFFLED CLATTER TYPE NOISE COMING FROM THE CENTER OF THE PASSENGER COMPARTMENT, JUST REARWARD OF THE DRIVER AND PASSENGER SEATS. THIS CONDITION IS MOST APPARENT WHEN THE VEHICLE IS OPERATED AT LOW SPEEDS OVER AN IRREGULAR ROAD SURFACE WITH REPETITIVE SMALL BUMPS, SUCH AS A "RUMBLE STRIP".

CAUSE:

CONDITION MAY BE CAUSED BY INTERNAL VALVE NOISE OF THE HYDRAULIC MOUNT ASSEMBLY BEING TRANSMITTED INTO THE VEHICLE BODY STRUCTURE.

CORRECTION:

REPLACE EXISTING REAR DIFFERENTIAL/TRANSMISSION MOUNT ASSEMBLY WITH A NEW ASSEMBLY, P/N 22178940, FOLLOWING THE SERVICE PROCEDURE AS OUTLINED IN THE SERVICE MANUAL, SECTION 4 (DRIVELINE/AXLE).

PARTS INFORMATION:

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

22178940 TRANSMISSION MOUNT ASSEMBLY

PARTS ARE EXPECTED TO BE AVAILABLE FROM GMSPO, 3/18/98.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

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

F3017 MOUNT, DIFFERENTIAL REAR 1.4 HR REPLACE

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.