For 1990-2009 cars

# INFO ON WHISTLE TYPE NOISE WHILE DRIVING CAUSED BY TRANS.

THIS IS A MONTHLY SERVICE NEWSLETTER ARTICLE. THIS BULLETIN IS NOT INTENDED FOR PUBLICATION.

#### SUBJECT: INFORMATION ON WHISTLE TYPE NOISE WHILE DRIVING CAUSED BY TRANSAXLE SPROCKETS

#### MODELS: 1997 BUICK PARK AVENUE/ULTRA 1997 BUICK RIVIERA 1997 BUICK REGAL GS WITH 4T65E TRANSAXLE

TEA-KETTLE WHISTLE NOISE AT IDLE/DRIVING-SOUNDS LIKE VACUUM LEAK OR WHINE NOISE.

THE NOISE IS CAUSED BY THE MICRO-FINISH ON THE DRIVE SPROCKET (516), OR DRIVEN SPROCKET (506). REPLACE THESE PARTS TO REPAIR. ALSO CHECK DRIVE SPROCKET BEARING (521). SEE 1997 G BODY SERV MAN PAGE 7A-17 FOR EXPLODED VIEW.

FOR C BODY + G BODY 3800 (K-L36) NORMALLY ASPIRATED ENGINE: 35-TOOTH DRIVE GEAR PART# 24206266 35-TOOTH DRIVEN GEAR PART# 24206269

FOR C BODY + G BODY + W BODY 3800 (1-L67) SUPER CHARGED: 37-TOOTH DRIVE GEAR PART# 24206267 33-TOOTH DRIVEN GEAR PART# 24206271

ALSO NEEDED IS THE CASE COVER GASKET KIT PART# 24206391.

PARTS ARE AVAILABLE FROM GMSPO.

1998 VEHICLE PRODUCTION SHOULD NOT EXHIBIT THIS CONDITION.

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 1998 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.