NEW SECOND SERVO APPLY PIN 700R4- SEAL ELIMINATION

1983-86 PARISIENNE AND 1983-87 FIREBIRD MODELS EQUIPPED WITH THM 700-R4 (MD8)

TRANSMISSION MODELS:

All Models

BULLETIN COVERS:

Changes to the second servo apply pin that eliminated the two ring seals. This change eliminates the potential for seal damage during assembly. Testing has shown that any potential leakage in this area will not affect transmission performance.

DATE OF PRODUCTION CHANGE: (Figure 1) ------------------------- Beginning January 5, 1987 (Julian date 005) THM 700-R4 transmissions were built with the new servo apply pin (Figure 2).

SERVICE ACTION:

The new second servo apply piston pin (Figure 2) can be used on all 1982-1988 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 Number 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.