A/T - Intermittent No Reverse or Locks In Reverse
87olds4SUBJECT INTERMITTENT NO REVERSE OR LOCKS IN NUMBER: 87-T-43
REVERSE
DATE: August 28, 1987
1984 - 1987 CUTLASS CIERA, DELTA 88,
MODELS/YEARS NINETY-EIGHT AND TORONADO MODELS
WITH THM 440-T4 SECTION: 7A
Bulletin Covers:
A 1984 through 1987 vehicle equipped with a THM 440-T4 transaxle may have an intermittent no reverse or locking in reverse condition until shifted to a forward range prior to shifting into reverse ("unloading" the parking pawl). This condition may be caused by a "dent" on the parking pawl that does not allow the pawl to release until "unloaded".
FIGURE 1 - THM 440-T4 TRANSAXLE IDENTIFICATION INFORMATION:
Date of Production Change: (Figure 1)
Effective May 1, 1987 (Julian Date 121) all 1987 THM 440-T4 transaxles were produced with parking pawl assemblies not having a "dent".
FIGURE 2 - FINAL DRIVE INTERNAL GEAR ASSEMBLY:
FIGURE 3 - PARKING LOCK ACTUATOR ASSEMBLY:
Service Action: (Figures 2 and 3)
If this condition is encountered, remove transaxle and replace the final drive internal gear/parking pawl assembly (No. 673) and actuator guide, plunger and spring assembly (No. 709 - No. 711). Also inspect the parking gear for wear or damage and replace if necessary.
Service Parts Information:
Part Number Description
8656372 Final Drive Internal Gear/Parking Pawl Assembly
8656689 Acutator Guide, Plunger and Spring Assembly
8644238 Parking Gear
Service Manual Reference:
Refer to appropriate service manual for repair information.
FIGURE 2 - FINAL DRIVE INTERNAL GEAR ASSEMBLY:
Service Notes: (Figure 2)
Before installing the replacement parts, inspect the new final drive internal gear/parking pawl assembly to make sure it does not have a "dent".