Cutlass L4-138 2.3L VIN A FI HP (1990)
Figure 3 - Previous And New Case Bore
Figure 4 - Previous And New Parking Lock Pawl
CHANGE TO ASSEMBLY COMPONENTS:(Figures 1 - 4)
To expand model usage that includes vehicles with a heavier Gross Vehicle Weight (GVW), a new parking lock system will be used in the production of
all 1990 transaxle models for the 1990 Cutlass Ciera, Cutlass Supreme, Eighty-Eight, Ninety-Eight and Toronado models equipped with a
HYDRA-MATIC 4T60 (THM 440-T4). For this change to be implemented, the following parts were modified:
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Actuator guide is now wider by 0.65 mm (0.0261 for the increased thickness of the parking lock actuator assembly. The pawl lock-out plunger
assembly and spring are eliminated. Now, there is no need for a slot for the plunger to ride in; therefore, the slot has been eliminated. The "O" ring
(bushing/actuator guide) seal is now larger to accommodate the increased thickness of the actuator guide. (Figure 1)
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The parking lock actuator assembly "bullet" is now 1.77 mm (0.070") wider. The overall length of the new assembly is now 13.8 mm (0.543")
longer than the previous assembly. (Figure 2)
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Transaxle case bore for the actuator guide is now wider by 0.65 mm (0.026") to accommodate the wider actuator guide. (Figure 3)
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The parking pawl lock-out pin has been eliminated from the final drive parking lock pawl and the effective length reduced about 1.0 mm (0.0391
from bullet to parking gear because of the wider actuator "bullet". (Figure 4)
IMPORTANT:
The new parking lock system will not service past models, unless ALL the components are replaced including the transaxle case. The transaxle case,
parking lock actuator assembly, parking lock pawl and actuator guide are not Interchangeable wfth models built before September 25, 1989 (Julian Date
268).
DATE OF PRODUCTION CHANGE:
Starting September 25, 1989 (Julian Date 268) all HYDRA-MATIC 4T60 (THM 440-T4) will be built with the new parking lock system.
SERVICE PROCEDURE:
