For 1990-2009 cars

# SLOW/NO TCC APPLY OR SHUDDER REPLVALVE BODY COVER GASKET

#### SUBJECT: SLOW/NO TCC APPLY OR TCC SHUDDER (REPLACE AUXILIARY VALVE BODY COVER GASKET)

VEHICLES AFFECTED: 1993 "N" MODEL WITH 2.3L SOHC ENGINE AND 3T40 AUTOMATIC TRANSAXLE

#### CONDITION:

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Some 1993 N cars with a 2.3L SOHC engine (RPO L40) and HYDRA-MATIC 3T40 transaxle (RPO MD9) may have slow TCC apply, TCC shudder or no TCC apply. Cars that may have this condition have transaxle model 3CWC with Julian dates of 221 and earlier (August 9, 1992).

#### CAUSE:

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The suspect HYDRA-MATIC 3T40 transaxles were built with auxiliary valve body cover gaskets intended for a different model.

#### CORRECTION:

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Install the correct auxiliary valve body cover gasket.

#### SERVICE INFORMATION:

Only a small number of vehicles built with the incorrect auxiliary valve body cover gasket will possibly generate a customer concern. The customer would first notice torque converter clutch shudder, which can then wear out the clutch material and cause a loss of torque converter clutch apply.

If the vehicle has come in for service and the transaxle has torque converter shudder or no TCC apply, first replace the auxiliary valve body cover gasket. If the transaxle still has TCC shudder or no TCC apply, replace the torque converter.

#### SERVICE PARTS INFORMATION:

Part Name Part Number

Gasket, Auxiliary Valve Body Cover 8666381

Torque Converter Asm.(FZBB) 8664910

#### SERVICE MANUAL REFERENCE:

Refer to the HYDRA-MATIC 3T40 Automatic Transaxle Unit Repair Section of the appropriate Service Manual for instructions on replacing the auxiliary valve body cover gasket.

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.