NEW SECOND SERVO APPLY PIN 700R4- SEAL ELIMINATION

MODEL AND YEAR: 1987 PASSENGER CARS 1987-88 LIGHT DUTY TRUCKS WITH THM 700-R4 TRANSMISSION

THM 700-R4 transmissions assembled beginning January 5, 1987, (Julian date 005, refer to Figure 1), were built with a new design second servo apply pin.

Changes to the second servo apply pin eliminates the potential for seal damage during assembly. The changes were the elimination of the two-ring seals as shown in Figure 2. Testing has verified that any potential leakage in this area will not affect transmission performance.

The new design second servo apply pin can be used on all 1982-88 THM 700-R4 transmissions.

NOTICE: If a past design second servo apply pin is used on a THM 700-R4 transmission, seal rings must be installed.

SERVICE PARTS INFORMATION: SECOND SERVO APPLY PIN

PART NO. DESCRIPTION PIN LENGTH

8667571 IDENTIFICATION 2-RINGS 66.37-66.67mm (2.61"-2.62") 8667572 IDENTIFICATION 3-RINGS 66.74-68.04mm (2.67"-2.68") 8667573 IDENTIFICATION WIDE BAND 69.11-69.41mm (2.72"-2.73")

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.