INTERMITTENT SLIP IN FORWARD AND/OR REVERSE

MODELS AFFECTED: 1989 DE VILLES, ELDORADOS, SEVILLES, AND ALLANTES

Some 1989 DeVilles, Eldorados, Sevilles, and Allantes may experience an intermittent transaxle slip in forward and/or reverse when cold. This may be due to one or more undersized input shaft oil rings (624) that seal the input clutch and 3rd clutch feed holes. The slipping may occur less in reverse or manual lo ranges (due to boosted line pressure) than in the other drive ranges.

Service Action:

THM 440-T4: Disassemble the transaxle, remove the input shaft and housing assembly (626) and inspect the shaft oil seal rings in the grooves. Replace them if they do not occupy the full groove width, refer to Figure 1. Use parts listed under Service Parts Information.

IMPORTANT: INSPECT THE 3RD CLUTCH AND INPUT CLUTCH ASSEMBLIES FOR DAMAGE OR EXCESS WEAR. REPAIR AS NECESSARY.

THM F-7: Replace the transaxle with a SRTA unit.

Service Parts Information:

PN Description

662959 Package, Overhaul Seals and Gaskets 662960 Package, Overhaul Repair Complete (for burned input and 3rd clutch plate assemblies)

WARRANTY INFORMATION VEHICLE SERIES Operation Operation Description Number C D E J K V

Clutch, Second, Reverse K7535 6.0 6.6 6.6 Band, Input and Third Clutches, Input Sprag and Third Roller Clutch and Reverse Reaction Drum - Replace

Transmission Assembly K7000 5.5 - Replace Part Group:

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.