A/T - Leak Near 1-2 Servo Casting Slot

9209pontiac01

Bulletin Number: 91-7-41
Reference Number: 177131
Publish Date: 1/92


Subject: LEAK NEAR 1-2 SERVO CASTING SLOT (REPLACE TRANSAXLE CASE)

Models 1991 6000, BONNEVILLE AND
Affected: GRAND PRIX MODELS WITH
4T60 TRANSAXLE


1991 HYDRA-MATIC 4T60 (ME9)

TRANSAXLE MODELS:

1WFH, 1YSH, 1YTH, 1WJH, 1WMH 1WPH, 1WXH, 1WWH, 1YDH, 1YHH

Transaxle fluid leak may be present due to a case crack near the 1-2 servo on some 1991 6000, Bonneville, or Grand Prix vehicles equipped with a 4T60 transaxle.

Figure 1:

Service Information: (Figures 1, 2, and 3)


If the transaxle exhibits a leak near the 1-2 servo and was built between Julian Date 172 (June 17, 1991) and Julian Date 1-86 (July 28, 1991) and has a case casting die number of 594, stress cracks may be present. Inspect the case for stress cracks originatinq from the corner of the case casting slot. If cracks are present, the transaxle case must be replaced.

Service Parts Information:

Part Number Description Model Usage

8668986 Package, Transaxle Service 1WJH, 1WMH, 1WPH, 1WXH
Case Assembly - Complete 1WWH, 1YDH, 1YHH

8668985 Package, Transaxle Service 1WFH, WYSH, WYTH
Case Assembly - Complete


Parts are currently available from GMSPO.

Labor Time Information:

Labor time should be charged under Operation Number K7800 from the 1991-1992 Labor Time Guide manual.

Service Manual Reference:

Refer to the appropriate 1991 Service Manual for the proper case replacement procedure.