For 1990-2009 cars

# SECOND GEAR VIBRATION (REPL. HUB SHAFT BRG. & SLEEVE ASSY.)

#### SUBJECT: SECOND GEAR VIBRATION BETWEEN 40-55 MPH - MEDIUM TO HEAVY THROTTLE (REPLACE HUB SHAFT BEARING AND SLEEVE ASSEMBLY)

#### MODELS: 1994 CHEVROLET BERETTA AND CORSICA 1994 OLDSMOBILE ACHIEVA 1994 PONTIAC GRAND AM 1994 BUICK SKYLARK (EQUIPPED WITH 3.1L (L82) ENGINE)

#### TRANSAXLE APPLICATIONS:

1994 HYDRA-MATIC 4T60-E (RPO M13)

#### TRANSAXLE MODELS:

4WBW, 4WSW

THIS BULLETIN IS BEING REVISED TO CHANGE THE REPAIR COMPONENT NAME AND WARRANTY INFORMATION. PLEASE DISCARD BULLETIN 377135.

CONDITION: (FIGURE 1) SOME OWNERS MAY EXPERIENCE A TRANSAXLE VIBRATION WHILE IN 2ND GEAR BETWEEN 40-55 MPH, (MEDIUM TO HEAVY THROTTLE). THIS VIBRATION WILL BE MORE NOTICEABLE AT HIGH ENGINE SPEEDS, FOR EXAMPLE DURING A 4-2 DOWNSHIFT.

CAUSE: (FIGURE 2) THIS CONDITION MAY BE DUE TO AN OFF CENTER BORE IN THE FORTH CLUTCH HUB AND SHAFT ASSEMBLY THAT HOUSES THE FOURTH CLUTCH BEARING ASSEMBLY. THE OFF CENTER BORE MAY CAUSE THE TRANSAXLE TO VIBRATE IN SECOND GEAR AT HIGH ENGINE SPEEDS.

CORRECTION: (FIGURE 2) A NEW FOURTH CLUTCH HUB AND SHAFT ASSEMBLY HAS BEEN RELEASED. THE NEW FOURTH CLUTCH HUB AND SHAFT ASSEMBLY CAN BE IDENTIFIED BY A PURPLE (INK) STRIPE AROUND ITS SHAFT.

SERVICE PART INFORMATION:

PREVIOUS NEW PART NUMBER NUMBER DESCRIPTION MODELS __________ ________ ___________ ______ 8683550 24201094 HUB SHAFT BEARING AND SLEEVE ALL ASSEMBLY, FOURTH CLUTCH

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

#### WARRANTY INFORMATION:

LABOR OPERATION: K5728 USE PUBLISHED LABOR OPERATION TIME.

FIGURES: 2

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER." THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS OCCURRING 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 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 1993. GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.