A/T - THM 3T40 New Roller Clutch

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Number: 91-184-7A


Section: 7A


Date: February 1991


Corporate Bulletin No.: 177103


Subject: NEW ROLLER CLUTCH


Model and Year: 1982-91 CELEBRITY, CAVALIER, CORSICA, BERETTA, CHEVETTE, LUMINA AND CITATION WITH 3T60 AUTOMATIC TRANSMISSION

Figure 1:

Figure 2:

BULLETIN COVERS:


A new NDH Roller Clutch (662) for all HYDRA-MATIC 3T40 transaxles, for increased Lo Roller clutch durability. This new 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. (Figures 1 and 2)

DATE OF PRODUCTION CHANGE:


This new roller clutch went into production October 23, 1990 (Julian Date 296) for all Willow Run built models. Windsor built models will be equipped with this new roller clutch at a future production 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 HYDRAMATIC 3T40, refer to the Unit Repair Section of your service manual.