DeVille V6-260 4.3L DSL (1985)
Transmission Vacuum Regulator Valve: Customer Interest
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
