NEW SECOND SERVO APPLY PIN 700R4- SEAL ELIMINATION

MODELS: 1982-88 LIGHT DUTY MODELS EOUIPPED WITH THM 700-R4 AUTOMATIC TRANSMISSIONS

BULLETIN COVERS:

This bulletin covers changes to the second servo apply pin that eliminated the two ring seals. This change reduces the potential for seal damage during assembly. Testing has shown that any potential leakage in this area with the new design pin will not affect transmission performance. (Figure No. 1)

Beginning January 5, 1987 (Julian date 005) THM 700-R4 transmissions were built with the new servo apply pin (Figure No. 2).

SERVICE ACTION:

The new second servo apply piston pin (Figure No. 2) can be used on aII 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 Pin Second Apply 66.37-66.67mm (2.61"-2.62") (2 IDENTIFICATION RINGS) 8667572 Pin Second Apply 66.74-68.04mm (2.67"-2.68") (3 IDENTIFICATION RINGS) 8667573 Pin Second Apply 69.11-69.41mm (2.72"-2.73") (WIDE BAND)

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.