SHIFT FORK WEAR REPLACEMENT RECOMMENDATION

CONDITIONS OF WORN 76MM TRANSAXLE SHIFT FORKS (BOTH 1-2 AND 3-4) HAVE BEEN FOUND TO BE CAUSED BY THE SHIFT FORK GROOVE SURFACE FINISH IN THE SYNCHRONIZER ASSEMBLY. TO CORRECT A WORN SHIFT FORK CONDITION, REPLACEMENT OF THE 1-2 SYNCHRONIZER ASSEMBLY WITH NEW P/N 14062629 OR 3-4 SYNCHRONIZER ASSEMBLY WITH NEW P/N 14062631, TOGETHER WITH THE SHIFT FORK IS MANDATORY. WHILE THE OLD SYNCHRONIZER ASSEMBLY MIGHT APPEAR TO BE REUSEABLE, THE SHIFT FORK GROOVE IN THE SYNCHRONIZER ASSEMBLY WILL CONTAIN MICROSCOPIC BURRS FROM RUNNING METAL TO METAL WITH THE FORK AND WILL CAUSE CONDITION TO RECUR. THE NEW SYNCHRONIZER ASSEMBLIES INCORPORATE A SMOOTHER SURFACE IN THE SHIFT FORK GROOVE. SERVICE OF THE SYNCHRONIZER ASSEMBLY REQUIRES THE REMOVAL OF THE SPEED GEARS FROM THE INPUT OR OUTPUT SHAFTS AS OUTLINED IN THE SERVICE MANUAL. A PARTS BULLETIN WILL ADVISE AVAILABILITY OF NEW 3-4 SYNCHRONIZER, P/N 14062631. THIS SUPERCEDES AND REPLACES BULLETIN 80-I-62.

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.