SUN GEAR SHELL/THRUST WASHER INFO/ 250 AND 350 TRANS

BEGINNING LATE 1982, CHEVROLET THM 350 TRANSMISSIONS WERE BUILT WITH THE CURRENT DESIGN THM 250 SUN GEAR SHELL AND THRUST WASHER. THE CURRENT DESIGN THM 250 SUN GEAR SHELL CAN BE IDENTIFIED BY THE PRESENCE OF SIX (6) CIRCULAR HOLES IN THE HOUSING; WHILE THE THM 350 SUN GEAR SHELL HAS NO HOLES. IF THE SUN GEAR SHELL AND/OR SUN GEAR SHELL THRUST WASHER IS REPLACED ON ANY THM 350 TRANSMISSION, BE CERTAIN TO DO THE FOLLOWING: 1.IDENTIFY THE DESIGN OF THE SUN GEAR SHELL (THM 250 OR THM 350). 2.IF THE SUN GEAR SHELL IS THM 250 DESIGN USE PART NUMBER 8640717 FOR SUN GEAR SHELL 8640718 FOR SUN GEAR SHELL THRUST WASHER 3.IF THE SUN GEAR SHELL IS THM 350 DESIGN USE PART NUMBER 1241726 FOR SUN GEAR SHELL 1241725 FOR SUN GEAR SHELL THRUST WASHER PLEASE BE ADVISED THAT IF ANY OF THE ABOVE THM 250 PARTS AND THM 350 PARTS ARE INTERCHANGED, INCORRECT END PLAY WILL RESULT. IF FOR ANY REASON THE ABOVE THM 350 DESIGN PARTS ARE NOT AVAILABLE FOR SERVICE WHEN REQUIRED, YOU MAY REPLACE BOTH PARTS WITH THE THM 250 DESIGN.

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.