Seville V8-273 4.5L (1989)
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
II. Harsh 3-2 and/or 4-2 Shifts
1985-1990 DeVilles and Fleetwoods and 1986-1990 Eldorados and Sevilles
Service Procedure:
Harsh 3-2 and 4-2 shifts at any altitude may be caused by a missing or partial hole in the spacer plate. Remove the valve body and inspect the spacer
plate for a missing or partial governor passage hole (25) as shown in Figure 3. A partial hole can be drilled out using a 777 drill bit to meet the hole size
requirement of .46 mm (.018"). If the hole is missing, use the spacer plate gasket and control valve body as a guide to locate and drill the hole or replace
the spacer plate.
III. Intermittent Harsh Part Throttle 3-2 Shift
1985-1986 DeVilles and Fleetwoods and 1986 Eldorados and Sevilles
