For 1990-2009 cars

# NEW DESIGN SECOND CLUTCH PISTON INNER SEAL

TRANSMISSION APPLICATIONS: SUBJECT: ------------------------- -------- 1984-1988 THM 440-T4 (ME9) NEW 2ND CLUTCH PISTON SEAL

TRANSMISSION MODELS: VEHICLE APPLICATIONS: ------------------- -------------------- ALL MODELS A, C, H, E, K, W CARS

#### BULLETIN COVERS:

Service part information on a new second clutch piston inner seal (614B) for all 1984 through 1988 vehicles equipped with a THM 440-T4 transaxle. This new seal uses a different material (Viton Tm) than the previous seal and can be identified by its part number (8668074) molded into the lip of the seal (Figure 2).

DATE OF PRODUCTION CHANGE: (Figure 1) -------------------------- October 30, 1987 (Julian Date 303), all 1988 THM 440-T4 transaxles were built using the new 2nd clutch piston inner seal (614B).

#### SERVICE ACTION:

When servicing the second clutch assembly on a 1984 through 1986 THM 440-T4 transaxle either the new seal or previous seal may be used. However, when servicing the second clutch assembly on a 1987 or 1988 THM 440-T4 transaxle, only use the 2nd clutch piston inner seal (614B) contained in the service package listed in the Service Parts Information section.

#### SERVICE PARTS INFORMATION:

Service Package No. Contents ------------------ -------- * 8662935 (1) 2nd Clutch Piston Inner Seal (614B) (1) 2nd Clutch Piston Outer Seal (614A)

* NOTE: This seal package must be ordered when using the following overhaul packages:

- 8646975 Overhaul Seals and Gaskets Package - 8646976 Overhaul Repair Complete Package

Discard the 2nd clutch piston inner seal (614B) contained in these overhaul packages if it is not identified as shown in Figure 2.

#### SERVICE MANUAL REFERENCE:

Refer to the THM 440-T4 (ME9) Automatic Transaxle Unit Repair Table of Contents for 2nd Clutch Assembly service information.

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.