A/T - Intermittent Slip In Forward/Reverse When Cold

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Bulletin
89-7440-3

Date
Dec. '88

Ref. No.
89-046-7440

Corp. Ref. No.
877150


SUBJECT:
INTERMITTENT SLIP IN FORWARD AND/OR REVERSE WHEN COLD

MODELS AFFECTED:
1989 THM 440-T4/HMD4T60 CENTURY, ELECTRA, RIVIERA, LESABRE, AND REGAL (SERVICE PKG)





BULLETIN COVERS

An intermittent slip in forward and/or reverse when the transaxle is cold may be caused by leaking Input Shaft Oil Seal Ring(s) (624). This may be due to one or more undersized Input Shaft Oil Seal Ring(s) that seal the Input Clutch and 3rd Clutch feed holes. The transaxle may slip less in Reverse or Manual Low (D1) ranges (due to boosted line pressure) than in Overdrive (D4), Drive (D3), or Manual Second (D2).

SERVICE ACTION

Disassemble the transaxle, remove the Shaft and Housing Assembly (626) and inspect the Input Shaft Oil Seal Rings (624) while in the grooves. The rinqs should take up most of the groove width. If the ring(s) only take up about half of the groove width then replace them with rings from the package listed under Service Parts Information. Follow procedures outlined in the 1989 Service Manual Unit Repair Section.

Important:
Inspect for burned Input and 3rd Clutch Plate Assemblies. Replace if necessary.

SERVICE PARTS INFORMATION

Part No Description

8662959 Package, Overhaul Seals and Gaskets
(OK Input and 3rd Clutch Plate Assemblies)

8662960 Package, Overhaul Repair Complete
(For burned Input and 3rd Clutch Plate Assemblies)

Parts are currently available from GMSPO.

SERVICE NOTES

The Oil Seal Pings may be different colors. This is just a way to tell the difference between suppliers that make the same ring.