VI. Harsh 3-2 Shift Maneuver At 17-20 MPH

1985-1986 DeVilles and Fleetwoods and 1986 Eldorados and Sevilles

A 3-2 shift maneuver is obtained by allowing the vehicle to coast down to 17-20 mph (with closed or zero throttle) and then stepping into the throttle to obtain a 3-2 shift.





At start of production (SOP) 1987 an orifice pipe was added between the 1-2 servo release cover plate and the 3-2 coast down valve to allow a smoother second gear apply. Refer to Figure 6. The four new parts installed as a set will service certain past model transaxles with a harsh 3-2 shift maneuver condition.

Parts are currently available from GMSPO.

Refer to the Hydra-Matic 4T60 (ME9) Automatic Transaxle Unit Repair Table of Contents for appropriate service information.

If the new pump body assembly has a "one terminal" third clutch switch, remove it and replace with the "two terminal" third clutch switch from the original pump body assembly.





When servicing a transaxle for the above described condition in designated high altitude areas (Figure 8), also install the 3-2 control valve spring package described in Section of this bulletin.

Also, ensure the 3-2 control valve and 1-2 servo control valve move freely in their bores.