A/T - 4T60 Fluid Leak Near 1-2 Servo Casting Slot

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Bulletin 91-74T60-18

Date Feb. '92

Ref. No. 91-292-74T60

Corp. Ref. No. 177131


SUBJECT:

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

MODELS AFFECTED:

1991 CENTURY, LESABRE AND REGAL WITH 4T60 TRANSAXLE


A transaxle fluid leak may be present due to a transaxle case crack near the 1-2 servo on some 1991 Century, Regal and LeSabre models equipped with a 4T60 transaxle.





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 186 (July 28, 1991) and has a case casting die number of 594, stress cracks may be present. Inspect the case for stress cracks originating from the corner of the case casting slot. If cracks are present, the transaxle case must be replaced.

PARTS INFORMATION:

Part Number Description Model Usage

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

8668985 Package, Transaxle Service 1WFH
Case Assembly - Complete

Parts are currently available from GMSPO.

WARRANTY INFORMATION:

Use Operation Number K7800 from the 1991-1992 Labor Time Guide manual.

SERVICE MANUAL REFERENCE:

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