ENGINE STALLS WHILE ENGAGING IN REVERSE OR DRIVE

MODELS AFFECTED: ALL 1987-88 VEHICLES EQUIPPED WITH THM-125C (MD9) TRANSAXLES

BULLETIN COVERS

A new design auxiliary valve body has a new filter in the TCC feed passage. The new auxiliary valve body filter will reduce the potential of TCC solenoid sticking and the resulting condition of the engine stalling while shifting into Reverse or Drive.

DATE OF PRODUCTION CHANGE: (Figure 1) ------------------------- March 9, 1987 (Julian Date 068), New Auxiliary Valve Body Filter and Auxiliary Valve Body.

SERVICE PARTS INFORMATION

Package No. Package Description

8664921 (1) 8660789 Gasket, Auxiliary Valve Body (1) 8664847 Gasket, Auxiliary Valve Body (8KDC ONLY) (1) 8664811 Filter, Auxiliary Valve Body (1) 8660039 Gasket, Valve Body Cover (1) 8664922 Instruction Sheet

SERVICE MANUAL REFERENCE

When servicing any 1988 THM 125C transaxle with these parts refer to the 1988 THM 125C (MD9) Automatic Transaxle Unit Repair Section in your service manual.

SERVICE NOTES (Figures 2 and 3)

The new auxiliary valve body is not interchangeable with models built prior to Julian Date 068, March 9, 1987. The past designed auxiliary valve bodies are not machined to allow for installation of new filter. The auxiliary valve body gasket part no. 8660789 is interchangeable with 1987 and 1988 THM 125C transaxles only. Gasket 8664847 can only be used on 1988 KDC models.

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.