GM Service Manual Online
For 1990-2009 cars only

3-4 ACCUMULATOR PISTON/O-RING IS WITHIN NOT VISABLE ON EXTER

INTERMEDIATE BAND WEAR AND/OR TRANSMISSION SLIPPAGE IN 2ND GEAR COULD RESULT FROM A LEAKING 3-4 ACCUMULATOR PISTON AND "O" RING SEAL. BEGINNING IN EARLY PRODUCTION 1982, THM 200-4R TRANSMISSIONS HAVE BEEN BUILT WITH A NEW DESIGN 3-4 ACCUMULATOR PISTON AND "O" RING SEAL, TO ENHANCE THE 3-4 ACCUMULATOR PISTON SEALING CAPACITY (REFER TO FIGURE 1). THE NEW DESIGN 3-4 ACCUMULATOR PISTON AND SEAL PACKAGE (P/N 8634956) IS AVAILABLE AND SHOULD BE USED WHEN REPLACING THE PAST DESIGN. THE NEW DESIGN 3-4 ACCUMULATOR "O" RING SEAL (P/N 8635568) IS ALSO AVAILABLE SEPARATELY. THE NEW DESIGN AND PAST DESIGN PARTS ARE NOT INTERCHANGEABLE. * ILLUSTRATION *


Object Number: 78220  Size: FS

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.