A/T - THM 440-T4 Harsh 3-2 Downshift

Bulletin No. T 87-44
File in Group 7
Number 149
Corp. Ref. No. 677122
Date Dec. '86

SUBJECT: 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.