NEW DEPARTURE HYATT ROLLER CLUTCH ALL HYDRA-MATIC 3T40

SUBJECT: NEW (NEW DEPARTURE HYATT) ROLLER CLUTCH

MODELS/YEARS: ALL 1991 AND PRIOR MODEL YEAR OLDSMOBILES EQUIPPED WITH HYDRA-MATIC 3T40 TRANSAXLES (RPO - MD9)

Hydra-Matic has released a new NDH (New Departure Hyatt) Roller Clutch (662) for all HYDRA- MATIC 3T40 transaxles, for increased Lo Roller clutch durability. This roller clutch has a new spring and roller holding cage which is plastic and black in color. The springs located inside the roller clutch have been rotated to a position of 90 degrees. See Figures 1 and 2 on the back of this bulletin.

DATE OF PRODUCTION CHANGE:

This new roller clutch went into production October 23, l990 (Julian Date 296) for all Willow Run built models. Windsor built models will be equipped with this new roller clutch at a future date.

SERVICE PARTS INFORMATION:

This new roller clutch may be used in all prior model year HYDRA-MATIC 3T40 transaxles. Whenever ordering this new NDH roller clutch, refer to the following part number:

Part Number Description ----------- --------------------------- 930681 (NDH) Roller Clutch Assembly

Parts are currently available from GMSPO.

SERVICE MANUAL REFERENCE:

Whenever replacement and/or installation of a NDH roller clutch is necessary on any HYDRA-MATIC 3T40, refer to the Unit Repair Section of your service manual.

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.