For 1990-2009 cars

# LOOSE LUMBER NOISE FROM REAR OF VEHICLE

#### SUBJECT: LOOSE LUMBER NOISE FROM REAR OF VEHICLE WHEN DRIVING OVER SMALL BUMPS (REPLACE REAR SHOCK ABSORBERS)

#### MODELS: 1997-98 CHEVROLET VENTURE 1997-98 OLDSMOBILE SILHOUETTE 1997-98 PONTIAC TRANS SPORT

LONG WHEEL BASE MODELS ONLY WITH ELECTRONIC LEVEL CONTROL (G67) AND BUILT PRIOR TO THE FOLLOWING VIN BREAKPOINTS:

CHEVROLET WD131456 OLDSMOBILE WD131384 PONTIAC WD131452

#### IMPORTANT: THIS CONDITION DOES NOT APPLY TO THE OPEL SINTRA.

#### CONDITION:

SOME OWNERS MAY COMMENT ON A "LOOSE LUMBER" TYPE MOISE COMING FROM THE REAR OF THE VEHICLE AND AUDIBLE IN THE VEHICLE'S PASSENGER COMPARTMENT. THIS CONDITION IS MOST APPARENT WHEN DRIVING OVER A SERIES OF SMALL TO MODERATE BUMPS (WASHBOARD GRAVEL OR ROUGHLY PATCHED ASPHALT ROAD SURFACE), WHICH CAUSE HIGH FREQUENCY, LOW DISPLACEMENT WHEEL MOTIONS.

#### CAUSE:

THE NOISE CONDITION MAY BE GENERATED BY THE INTERNAL VALVING MECHANISM OF THE REAR SHOCK ABSORBERS AND IS TRANSMITTED INTO THE BODY BY THE UPPER SHOCK ABSORBER MOUNT. VARIATION IN SHOCK ABSORBERS CAN MAKE SOME VEHICLES WORSE THAN OTHERS.

#### CORRECTION:

REPLACE BOTH REAR SHOCK ABSORBERS WITH NEW ASSEMBLIES, P/N 22064847, FOLLOWING THE PROCEDURE IN SECTION 3D, REAR SUSPENSION, OF THE APPLICABLE SERVICE MANUAL.

#### PARTS INFORMATION:

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

#### WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION NUMBER: E5847 (BOTH) USE PUBLISHED LABOR OPERATION TIME.

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.

COPYRIGHT 1997 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.