Campaign - A/T 4L60 Replacement: Overview

9219chevy02

GMC NUMBER: 91-C-15

GROUP: 7A - AUTOMATIC TRANSMISSION

DATE: JUNE 1991


SUBJECT:
4L60 TRANSMISSION SOFT TURBINE SHAFT

MODELS:
1991 C/K PICKUP TRUCKS AND G-VANS EQUIPPED WITH 4L60 AUTOMATIC TRANSMISSIONS (MD8)


FOLLOWING INFORMATION SENT VIA DCS MESSAGE TO INVOLVED SELLING DEALERS ON JUNE 21, 1991.


General Motors has determined that a small number of 1991 C/K pickup trucks and G-Vans, equipped with 4L60 automatic transmissions (MD8), may have been built with a transmission turbine shaft that may be at less than specified hardness. This is likely to cause a failure of the turbine shaft in the first 2,000 miles of vehicle usage, resulting in total loss of drive power in forward and/or reverse.

To prevent this condition from occurring, it is necessary to replace the transmission with a new transmission assembly.


VEHICLES INVOLVED





Involved are certain 1991 C/K pickup trucks and G-Vans equipped with 4L60 automatic transmissions (MD8) built between 5/31/91 and 6/4/91. Dealer codes and vehicles involved are listed.


DEALER CAMPAIGN RESPONSIBILITY

Dealers are to service all vehicles subject to this campaign at no charge to owners, regardless of mileage, age of vehicle, or ownership, from this time forward. Dealers are to correct all affected vehicles in new vehicle stock prior to their sale.

Should vehicles be sold inadvertently from your new vehicle inventory, prior to repair, owners are to be contacted by the dealer and arrangements made to make the required correction according to instructions contained in this bulletin.