INFORMATION ON AUTOMATIC TRANSMISSION REPAIR

SUBJECT: INFORMATION ON AUTOMATIC TRANSMISSION REPAIR OR REPLACEMENT

MODELS: 1993 CHEVROLET AND GMC TRUCK "T" PICKUP AND "T" UTILITY 1994 CHEVROLET AND GMC TRUCK "T" UTILITY WITH 4.3L V6 ENGINE (VIN CODES Z AND W - RPOS LB4 AND L35) AND AUTOMATIC TRANSMISSION (RPO M30) BUILT WITH THE FOLLOWING VIN BREAKPOINTS:

BEGINNING YEAR MAKE MODEL PLANT W/VIN THRU 1993 GMC T PU AND UTILITY PONTIAC PO511791 EOP 1993 GMC T PU AND UTILITY MORAINE P2518818 EOP 1993 GMC T PU AND UTILITY SHREVEPORT P8516846 EOP 1993 CHEVY T PU AND UTILITY PONTIAC P0136221 EOP 1993 CHEVY T PU AND UTILITY MORAINE P2147417 EOP 1993 CHEVY T PU AND UTILITY SHREVEPORT P8168484 EOP 1994 GMC T UTILITY PONTIAC SOP R0501593 1994 GMC T UTILITY MORAINE SOP R2509567 1994 CHEVY T UTILITY PONTIAC SOP R0105753 1994 CHEVY T UTILITY MORAINE SOP R2126414

NOTICE: THIS BULLETIN DOES NOT APPLY TO ANY MANUAL TRANSMISSION EQUIPPED VEHICLE OR ANY 94 MODEL PICKUP.

WHEN SERVICING ONE OF THE LISTED VEHICLES FOR ANY REPAIR THAT REQUIRES THE REMOVAL OF THE TRANSFER CASE BRACE ROD (FIGURE 1, ITEM 1), IT IS NOT NECESSARY TO REINSTALL THE ROD FOLLOWING COMPLETION OF THE REPAIRS. THE ORIGINAL BOLT THAT ATTACHED THE ROD TO THE ENGINE (FIGURE 2, ITEM 2) SHOULD BE REPLACED WITH A SHORTER BOLT, P/N 9421037. IT IS NOT NECESSARY TO REPLACE THE BOLT THAT ATTACHED THE ROD TO THE TRANSFER CASE (FIGURE 1, ITEM 3).

REMOVING THE BRACE ROD ELIMINATES THE POSSIBILITY OF INDUCING A SIDE LOAD ON THE ALUMINUM TRANSMISSION CASE DUE TO DIFFERING THERMAL EXPANSION RATES WITH THE STEEL BRACE.

IMPORTANT: ALWAYS ADJUST SHIFT LINKAGE PER GM CORPORATE #467102 FOLLOWING ANY TRANSMISSION ASSEMBLY REMOVAL.

SERVICE PARTS INFORMATION:

P/N DESCRIPTION QTY 9421037 BOLT 1

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

FIGURES: 2

CAPTIONS: FIGURE 1 - TRANSFER CASE BRACE ASSEMBLY FIGURE 2 - TRANSMISSION TO ENGINE MOUNTING

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 1994 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.