A/T - Intermittent No Reverse Condition
Number: 87-160Section: 7A
Date: JUNE, 1987
Subject: INTERMITTENT NO REVERSE UNLESS FIRST SHIFTED INTO DRIVE
Model and Year: CELEBRITY MODELS WITH THM440-T4 TRANSAXLE
FIGURE 1 - PARKING PAWL:
TO: ALL CHEVROLET DEALERS
Celebrity models With THM440-T4 transaxles built before 1987 (Julian date 054) may experience a no reverse engagement condition unless shifted into a forward range prior to shifting into reverse, (i.e., unloading the parking pawl). This condition may be caused by a dent or poor finish on the parking pawl (see Figure 1), which will not allow the pawl to release until unloaded.
To repair this condition, replace the final drive internal gear/parking pawl assembly, P/N 8656372, the actuator guide, plunger and spring assembly, P/N 8656689, and O-ring seal, bushing actuator or guide, P/N 8646372. The parking pawl and final drive internal gear come as an assembly and cannot be ordered separately. Also, inspect the parking gear, P/N 8644238, for excessive wear or damage and replace as necessary.
NOTE: Before installing the replacement parts, inspect the parking pawl to ensure that it has an acceptable surface finish.
Use applicable labor operation and time.