CLUTCH CHATTER / SHUDDER ON LAUNCH (INSTALL CLUTCH KIT). GMC Truck S15 Pickup - 4WD 1994

For 1990-2009 cars

# CLUTCH CHATTER / SHUDDER ON LAUNCH (INSTALL CLUTCH KIT)

REVISION: 10/24/96

THIS BULLETIN IS BEING REVISED TO ADD S/T MODELS AND KIT PART NUMBERS FOR CLUTCHES IN TRUCKS EQUIPPED WITH 4.3L AND 5.0L ENGINES. PLEASE DISCARD CORPORATE BULLETIN NUMBER 66-73-04 (SECTION 7 - TRANSMISSION) **********************************************************************

#### SUBJECT: CLUTCH CHATTER/SHUDDER ON LAUNCH (INSTALL CLUTCH KIT)

#### MODELS: 1994-95 CHEVROLET AND GMC S/T, C/K 1,2,3 & P3 MODELS WITH 4.3L, 5.0L AND 5.7L ENGINES (VINS W, Z, H, K - RPOS L35, LB4, L03, L05) AND MANUAL TRANSMISSION

#### CONDITION:

SOME OWNERS MAY REPORT CLUTCH CHATTER OR SHUDDER WHEN LAUNCHING THE VEHICLE FROM A STOP.

#### CORRECTION:

THE FOLLOWING COMPONENTS SHOULD BE INSTALLED: - CLUTCH KIT WITH REVISED TUNING (DISC AND PRESSURE PLATE ASSEMBLY) - RELEASE BEARING WITH A STEEL SLEEVE - RELEASE FORK WITH CORRECTED FORK TIP RADIUS - NEW PILOT BEARING

#### SERVICE PROCEDURE:

FOLLOW THE APPROPRIATE SERVICE MANUAL PROCEDURE, SECTION 7C - CLUTCH, FOR CLUTCH ASSEMBLY REPLACEMENT.

#### IMPORTANT: ALIGN THE LIGHT SIDE OF THE PRESSURE PLATE ASSEMBLY, IDENTIFIED BY A PAINT DOT NEAR A BOLT HOLE, WITH THE HEAVY SIDE OF THE FLYWHEEL, IDENTIFIED BY AN "X". TIGHTEN EACH PRESSURE PLATE BOLT ONE TURN AT A TIME TO EVENLY COMPRESS THE SPRING AND AVOID WARPING THE PRESSURE PLATE ASSEMBLY.

TORQUE THE PRESSURE PLATE BOLTS TO 40 N.M (29 LBS. FT.).

#### PARTS INFORMATION:

P/N DESCRIPTION QTY 12375175 CLUTCH KIT (4.3L & 5.0L) 1 12388069 CLUTCH KIT (5.7L & MG5) 1 12388071 CLUTCH KIT (5.7L & MT8/MW3) 1 15613306 CLUTCH RELEASE BEARING 1 12385352 CLUTCH FORK 1 14061685 CLUTCH PILOT BEARING 1

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME K0800 CLUTCH DISC AND/OR COVER USE PUBLISHED REPLACE LABOR OPERATION TIME

#### IMPORTANT: LABOR OPERATION IS CODED TO BASE VEHICLE COVERAGE IN THE WARRANTY SYSTEM.

FIGURES: 0

CAPTIONS: 0

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 1996 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.