PROM - Early TCC Engagement

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GMC NUMBER: 92-7A-40

GROUP: 7A Automatic Transmission
DATE: January 1992

CORPORATE
NUMBER: 137107


SUBJECT: EARLY TRANSMISSION CONVERTER CLUTCH APPLY (INSTALL NEW PROM)

MODELS: 1992 S/T TRUCK WITH 4.3L AND 4L60 AUTOMATIC TRANSMISSION


Some owners of 1992 S/T trucks with 4.3L (LB4) engines and automatic transmissions may comment on early transmission converter clutch (TCC) engagement, TCC engagement just after the 2-3 upshift, or lack of power. This occurs because the [1][2]torque converter clutch is applied at low speeds during some driving conditions.

SERVICE PROCEDURE:
To correct this condition, install a new calibration PROM that raises the TCC apply speed. This calibration will increase the TCC apply speed on a 1992 vehicle to be similar to a 1991 vehicle (see below).

SERVICE PARTS INFORMATION:

Part PROM Scanner
Number Application Broadcast I.D.
16175285 Federal BARL 5551
16175286 California BARM 5561


Parts are expected to be available on January 27, 1992. In case of limited inventory, parts will be placed on 400 Control to waive VIP surcharges. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. However, the part will be shipped premium transportation at dealer's expense and all other order types will be placed on backorder until the 400 control is removed.

WARRANTY INFORMATION:

Labor Operation Number: T0500

Labor Time: 0.8 Hour