SERVICE GUILD: 3-4 ACCUMULATOR PISTON AND SPRING POSITIONING

MODELS AFFECTED: ALL 1986-88 VEHICLES EQUIPPED WITH THM 200-4R (MW9) TRANSMISSION

BULLETIN COVERS (Figure 1)

Two possible stackups for the 3-4 accumulator piston and spring, for different calibration requirements.

SERVICE ACTION

When servicing a THM 200-4R transmission, refer to Figures 2 and 3 to check the positioning of the 3-4 accumulator piston and spring for all 1986-88 models.

SERVICE MANUAL REFERENCE

Refer to the THM 200-4R Service Manual for 3-4 accumulator removal and installation procedures.

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.