Electra Park Avenue V6-231 3.8L VIN 3 FI (1988)
Shift Modulator: All Technical Service Bulletins
Harsh 3-2 Shift Maneuver At 17-20 MPH
IV.
HARSH 3-2 SHIFT MANEUVER AT 17-20 MPH
1985-1/2 - 1986 Century, Electra/Park Avenue, Riviera, and LeSabre models
A 3-2 shift maneuver is obtained by allowing the vehicle to coastdown to 17-20 mph (with closed or zero throttle) and then stepping into the throttle to
obtain a 3-2 shift.
Service Procedure:
At start of production (SOP) 1987, an orifice pipe was added between the 1-2 servo release cover plate and the 3-2 coastdown valve to allow a smoother
second gear apply (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.
Service Manual Reference:
Refer to the HYDRA-MATIC 4T60 (ME9) Automatic Transaxle Unit Repair Table of Contents for appropriate service information.
Service Notes:
If the new pump body assembly has a "one terminal" 3rd clutch switch, remove it and replace with the "two terminal" 3rd clutch switch from the original
pump body assembly.
