Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1987S10/T10 P/U 2WD L4-151 2.5LREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSA/T - THM 700R4 NEW SECOND SERVO APPLY PIN
1987 Chevrolet S10/T10 P/U 2WD L4-151 2.5L
A/T - THM 700R4 New Second Servo Apply Pin
1987 Chevrolet S10/T10 P/U 2WD L4-151 2.5LSECTION A/T - THM 700R4 New Second Servo Apply Pin
Number: 87-177
Section: 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
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 - 66.67 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")
Section: 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")
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.