Electra Park Avenue V6-231 3.8L VIN 3 FI (1988)
Band Apply Servo: All Technical Service Bulletins
IA. Very Harsh Part Throttle 3-2 Shift At 20-40 MPH
1985 - 1990 Century, Electra/Park Avenue, Riviera/Reatta, LeSabre and Regal models
Service Procedure:
A part throttle downshift is a quick apply of the accelerator pedal beyond a medium throttle position (approximately 112 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 (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.