I. Very Harsh Part Throttle 3-2 Shift At 20-40 MPH

1985-1990 DeVilles and Fleetwoods and 1986-1990 Eldorados and Sevilles

Service Procedure:

A part throttle downshift is a quick apply of the accelerator pedal beyond a medium throttle position (approximately 1/2 of accelerator pedal travel), forcing a downshift.





A harsh part throttle 3-2 shift at 20-40 mph may be caused by a missing or mislocated # 2 3-2 control checkball. Refer to Figure 2. Remove the valve body to inspect for proper checkball location or damage to the spacer plate. A mislocated checkball may have bent the spacer plate. Also inspect the # 12 1-2 servo feed checkball to ensure it is seating properly.





Hydra-Matic 4T60 Transaxle Identification Information