THM 440-T4 HARSH 3-2 DOWNSHIFT 17 TO 20 MPH. AT ANY ALTITUDE

MODELS AFFECTED: 1985-1986 DE VILLE AND FLEETWOOD 1986 ELDORADO AND SEVILLE

Some 440-T4 transaxles may exhibit a harsh 3-2 downshift while braking or coasting to between 20 to 17 MPH, followed by an acceleration.

Install the following four parts as a set to correct the condition.

Part Number Description Application ----------- ----------- -----------

8662439 Body Assembly, Oil 5AM, JAY, 5AC, 6AAH, Pump Complete 6ABH, 6ACH, 6AFH, 6AMH, 6APH 8662376 Gasket, Release Cover 8662377 Pipe, Plug and Release Cover 8662394 Clip, Conduit

Note: If the new pump has a 1 pin 3rd clutch switch, remove it and replace with the 2 pin switch from the original pump body assembly.

Refer to the 440-T4 Transaxle Unit Repair section of the appropriate Service Information Manual for service information.

Special Note: When servicing the transaxle of vehicles normally driven in high altitude areas for this condition, also install the 3-2 control valve spring package covered in Serviceman Bulletin T-87-43.

Use operation number K6570 at 2.7 hours for De Villes and 3.2 hours for Eldorados and Sevilles.

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.