DRIVE LINE VIBRATION 4 & 5 SPEED M/T MOUNTING

SOME 1982 AND EARLY PRODUCTION 1983 S-TRUCKS MAY EXHIBIT A DRIVELINE VIBRATION OR AUDIBLE. THE VIBRATION OR AUDIBLE GENERALLY OCCURS IN THE ENGINE RPM RANGE OF 1700 TO 2200. THE CONDITION MAY BE ACCOMPANIED BY AN INSTRUMENT PANEL BUZZ. THE CONDITION IS LIMITED TO VEHICLES WITH THE FOLLOWING DRIVELINE COMBINATIONS. MODEL YEAR 1982 MANUAL TRANSMISSION TYPE 4-SPEED (M77) AND 5-SPEED (MB6) ENGINE V6 - 2.8L (LR2) MODEL YEAR 1983 MANUAL TRANSMISSION TYPE 4-SPEED (M77) AND 5-SPEED (MB6) ENGINE L4 - 2.0L (LQ2) A "TUNED" TRANSMISSION DAMPER ASSEMBLY, PART NUMBER 14073312, HAS BEEN RELEASED IN ORDER TO REDUCE THE VIBRATION OR AUDIBLE. FIGURES 1 AND 2 ARE USED TO ILLUSTRATE THE INSTALLATION OF THE DAMPER. 1982 VEHICLES LONGER TRANSMISSION MOUNT TO TRANSMISSION RETAINER BOLTS, PART NUMBER 11504597 (STANDARD PART), MUST BE USED WHEN INSTALLING THE DAMPER ON ALL APPLICABLE 1982 VEHICLES. 1983 VEHICLES THE ORIGINAL TRANSMISSION MOUNT AND ASSOCIATED PARTS MUST BE REPLACED WHEN INSTALLING THE DAMPER ON ALL APPLICABLE 1983 VEHICLES PRODUCED BEFORE THE DAMPER WAS AVAILABLE. FIGURE 2-A SHOWS THOSE PARTS WHICH ARE TO BE DISCARDED. INSTALL THE DAMPER ASSEMBLY USING THE PARTS LISTED BELOW. THE INSTALLATION IS SHOWN IN FIGURE 2-B. THE TRANSMISSION SUPPORT MEMBER IS ALREADY SLOTTED TO ACCOMMODATE THE DUAL CAPTIVE STUD MOUNTING FEATURE OF THE NEW MOUNT ASSEMBLY. PARTS FOR 1983 VEHICLES 14027910 MOUNT ASSEMBLY 11504597 RETAINER BOLTS (STANDARD PART) 3790768 WASHERS (STANDARD PART) FINALIZE EACH INSTALLATION BY TORQUING THE RETAINER BOLTS TO 54-65 N.M (40-43 FT. LBS) AND THE TORQUE-PREVAILING NUTS TO 28-38 N.M (21-28 FT. LBS). PRIOR TO REUSE, CLEAN AND INSPECT THE TORQUE-PREVAILING NUTS FOR DAMAGE. REPLACE NUT WITH PART NUMBER 11501033 (STANDARD PART) IF NECESSARY. (TWO ILLUSTRATIONS)

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.