A/T - THM 700R4 New Second Servo Apply Pin
Number: 87-177Section: 7A
Date: JULY, 1987
Subject: NEW SECOND SERVO APPLY PIN
THM 700-R4
Model and Year: 1987 PASSENGER CARS
1987-88 LIGHT DUTY TRUCKS WITH THM 700-R4 TRANSMISSION
TO: ALL CHEVROLET DEALERS
FIGURE 1 - THM 700-R4 TRANSMISSION IDENTIFICATION INFORMATION:
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.
FIGURE 2:
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 - 66.67 mm
(2.61" - 2.62")
8667572 IDENTIFICATION 3-RINGS 66.74 - 68.04 mm
(2.67" - 2.68")
8667573 IDENTIFICATION WIDE BAND 69.11 - 69.41 mm
(2.72" -2.73")