REVISED:2/3 SHIFT/LOSS OF 3RD THM 440-T4 3RD CLUTCH SEAL. Buick Electra/Park Avenue 1985

For 1990-2009 cars

# REVISED:2/3 SHIFT/LOSS OF 3RD THM 440-T4 3RD CLUTCH SEAL

#### MODELS AFFECTED: 1984-1986 T M 440-T4 (ME9)

#### BULLETIN COVERS:

A long and/or delayed 2-3 shift on a THM 440-T4 transaxle may be caused by a leaking 3rd clutch inner seal (Figure 1, Item 635A). A new, thicker seal is used in production and available in a Service Package.

DATE OF PRODUCTION CHANGE: (REFER TO FIGURE 2) ------------------------- September 1, 1986 (Julian Date 244), new 3rd clutch inner seal. This change is also on all Service Replacement Transmission Assembly (SRTA) models effective November 15, 1986 (julian Date 319).

#### SERVICE ACTION:

Remove transaxle, disassemble, inspect and replace the 3rd clutch inner seal, as well as other parts included in the appropriate Service Package.

#### SERVICE PARTS INFORMATION:

The new 3rd clutch inner seal (Part Number 8644919) is included in the following Service Package.

PACKAGE NUMBER DESCRIPTION -------------- ----------- 8646991 Package - Input Housing & Shaft Assembly

This package includes the following parts-

PART NUMBER DESCRIPTION ------------ ----------- 8645932 Input Housing and Shaft Assembly 8644919 Seal - 3rd Clutch Piston Inner 8662676 Roller Assembly Complete - 3rd Clutch

#### SERVICE MANUAL REFERENCE:

Refer to the THM 440-T4 (ME9) Automatic Transaxle Unit Repair Table of Contents for 3rd clutch 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.