NO 3RD GEAR (NEW THRUST BEARING)

MODELS AFFECTED: 1985-1989 DE VILLES AND FLEETWOODS 1986-1989 ELDORADOS AND SEVILLES

Some 1985-1989 DeVilles and Fleetwoods or 1986-1989 Eldorados and Sevilles may experience a condition of no third gear caused by heat damage of the thrust washer (628) and third roller clutch assembly (644). This can cause failure of the third roller clutch and result in loss of third gear. Refer to Figures 1 and 2.

A revised thrust bearing assembly (803) is now available to replace the input shaft/sun gear thrust washer (628) and lock up sleeve (690). To accommodate the revisions changes were also made to the input housing and shaft assembly (626), the third roller clutch dam (696), and the third roller clutch cam (643). All the revised parts are available in a package and must be installed together. Refer to Service Parts Information.

Service Notes:

The input shaft/sun gear thrust washer and lock Lip sleeve is no longer available for service from GMSPO for 1987 through 1989 models. Replace worn components for these model years with the revised thrust bearing and associated components. For 1985 and 1986 models use the revised input housing and shaft assembly package for distressed third roller clutch and/or input thrust washer concerns.

The cause of a distressed third clutch assembly could be leaking input shaft oil seal rings or a dislodged shaft/third clutch spring return snap ring causing a dragging third clutch pack. Replace the snap ring with a new one if it has been dislodged. Also, inspect the input clutch sprag assembly (653) and input sprag outer race (654) for damage. Damage could be caused by putting the transaxle in Drive 2 (D2) after a third roller clutch assembly failure (no third gear). Traveling at highway speeds, this will cause excessive overrun speeds for the sprag. Refer to Figure 3 for proper assembly of critical lubrication passages for the sprag and roller clutch.

IMPORTANT: Perform the input housing end play measurement when installing the new parts to assure proper end play.

Production Change Date:

These product changes occurred in production on November 28, 1988 (Julian Date 333).

SERVICE PARTS INFORMATION

P/N Description Model Year --- ----------- ---------- 8662970 Package - Input Housing and Shaft 1989 Assembly, Input Bearing Assembly, Thrust Roller Assembly Complete, Third Clutch Instruction Sheet, Input Thrust Bearing 8662975 Package - Input Housing and Shaft 1985-1988 Assembly, Input Bearing Assembly, Thrust Roller Assembly Complete, Third Clutch Instruction Sheet, Input Thrust Bearing

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

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

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.