A/T - 3-4 Gear Accumulator Piston and Spring Positioning

87buick11 Bulletin 88-7200-1

Date

Dec. '87

Ref. No. 88-032-7200

Corp. Ref. No. 877105

SUBJECT: 3-4 ACCUMULATOR PISTON AND SPRING POSITIONING INFORMATION

MODELS AFFECTED: ALL 1986-88 VEHICLES EQUIPPED WITH THM 200-4R (NW9) TRANSMISSION

Figure 1 - THM 200-4R Transmission Identification Information:

BULLETIN COVERS (Figure 1)

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

Figure 2 - 3-4 Accumulator Piston And Spring Assembly:

Figure 3 - 3-4 Accumulator Piston And Spring Assembly:

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.