SERVICE GUILD: 3-4 ACCUMULATOR PISTON AND SPRING POSITIONING

TRANSMISSION APPLICATIONS: SUBJECT: ------------------------- ------- 1986, 1987, 1988 THM 3-4 ACCUMULATOR PISTON AND SPRING 200-4R (MW9) POSITIONING INFORMATION

TRANSMISSION MODELS: VEHICLE APPLICATIONS: ------------------- -------------------- ALL MODELS ALL THM 200-4R EQUIPPED VEHICLES

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, 1987 and 1988 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.