HARSH CLUTCH ENGAGEMENT 'GARAGE SHIFT'

SUBJECT: HARSH CLUTCH ENGAGEMENT "GARAGE SHIFT" (INSTALL CONVERSION KIT)

MODELS: 1993 OLDSMOBILE CUTLASS CIERA 1993 BUICK CENTURY 1993 CHEVROLET CAVALIER 1993 PONTIAC SUNBIRD 1993 PONTIAC GRAND AM 1993 OLDSMOBILE ACHIEVA 1993 BUICK SKYLARK 1993 PONTIAC LEMANS 1993 CHEVROLET LUMINA 1993 PONTIAC GRAND PRIX 1993 CUTLASS SUPREME 1993 BUICK REGAL 1993 CHEVROLET LUMINA APV 1993 PONTIAC TRANS SPORT 1993 OLDSMOBILE SILHOUETTE

TRANSAXLE APPLICATIONS:

1993 HYDRA-MATIC 3T40 (RP0 MD9)

CONDITION:

VEHICLES CONTAINING HYDRA-MATIC 3T40 (RP0 MD9) TRANSAXLES MAY EXHIBIT A HARSH CLUTCH ENGAGEMENT (GARAGE SHIFT) WHEN THE GEAR SELECTOR IS MOVED FROM "REVERSE" TO "DRIVE" ON INITIAL START-UP.

CAUSE:

TO REDUCE THE HARSH GARAGE SHIFT CONCERN ("REVERSE TO DRIVE"), THE HYDRAULIC CIRCUIT AT THE MANUAL VALVE WAS REDESIGNED TO ALLOW REVERSE FLUID TO EXHAUST WITHOUT RESTRICTING ITS FLOW. THE FORWARD CLUTCH STACK (625 + 633) WAS ALSO MODIFIED TO IMPROVE THE APPLY FEEL DURING INITIAL ENGAGEMENT.

CORRECTION: (FIGURE 1 AND 2)

EFFECTIVE APRIL 1, 1993 (JULIAN DATE 091) THE THERMO ORIFICE (440) AND THERMO ORIFICE RETAINER (441) WERE ELIMINATED FROM THE MANUAL VALVE (406). (THERMO ORIFICE (440) AND ORIFICE RETAINER (441) WILL NOT BE REMOVED ON A-CAR OR T-CAR APPLICATIONS. THERMO ORIFICE AND RETAINER MAY BE ELIMINATED ON A-CAR AND T-CAR AT A LATER DATE.)

NOTE: THE FOLLOWING IS A LIST OF MODELS USED ONLY IN 1993 A-CAR AND T-CAR APPLICATIONS. (THE THERMO ELEMENT ORIFICE AND RETAINER ARE STILL PRESENT IN THE FOLLOWING MODELS.)

MODELS USED EXCLUSIVELY IN A-CARS. 3BYC, 3CMC, 3HPC, 3HCC, 3LCC, 3HXC, 3HTC, 3SWC, 3BZC

MODELS USED EXCLUSIVELY IN T-CARS. 3HBC, 3PTC, 3JAC, 3PTC, 3HSC, 3TLC

EFFECTIVE JUNE 22-24, 1993 (JULIAN DATE 152-154) THE FORWARD CLUTCH WAVE PLATES (625) WERE REPLACED WITH A SPRING, BELLEVILLE (625) AN ADDITIONAL FORWARD CLUTCH PLATE (633), A NEW BACKING PLATE (634) (NO LONGER SELECTIVE), AND A NEW SNAP RING (617).

SERVICE PART INFORMATION:

THE "CONVERSION KIT FORWARD CLUTCH FEEL" PACKAGE COMES COMPLETE WITH ALL THE PARTS NECESSARY TO UPDATE A HYDRA-MATIC 3T40 TRANSAXLE BUILT PRIOR TO THIS MID-YEAR PRODUCTION CHANGE. A NEW MANUAL VALVE WILL NOT BE INCLUDED IN THE "FORWARD CLUTCH FEEL" PACKAGE. THE PRIOR MANUAL VALVE CAN BE USED WHEN RETAINER (441) AND THERMO ELEMENT (440) ARE REMOVED.

SERVICE PACKAGE (INCLUDES) DESCRIPTION QTY. 24200479 CONVERSION KIT FORWARD 1 CLUTCH FEEL

KIT (24200479) INCLUDES 8685867 PLATE FORWARD CLUTCH 1 (BELLEVILLE) 8664163 PLATE FORWARD CLUTCH 1 (BACKING) 8631028 RING-INPUT CLUTCH 1 BACKING PLATE 2400477 INSTRUCTION SHEET 1

8685867 PLATE FORWARD CLUTCH 1 (BELLEVILLE)

8664163 PLATE FORWARD CLUTCH 1 BACKING

8631028 RING INPUT CLUTCH 1 BACKING PLATE

8683084 PLATE FORWARD CLUTCH 1

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY USE LABOR OPERATION K7202.

FIGURES: 3

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.