SERVICE MANUAL UPDATE-SEC. 7 HYDRA-MATICAUTO TRANS DIAG.

********************************************************************** TRANSMISSION APPLICATIONS: SUBJECT: 1993 HYDRA-MATIC 4L60-E (M30) 1993 SECTION 7 HYDRA-MATIC 4L60-E AUTOMATIC TRANSMISSION DIAGNOSIS MANUAL UPDATE

TRANSMISSION MODELS: VEHICLE APPLICATIONS: ALL C/K - TRUCKS UNDER 8600 GVW S/T - TRUCKS WITH 4.3L NON TURBO M/L AND G VANS

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BULLETIN COVERS:

NEW PRODUCT INFORMATION FOR 1993 HYDRA-MATIC 4L60-E TRANSMISSIONS. THIS INFORMATION HAS BEEN UPDATED SINCE PUBLICATION OF THE 1993 SERVICE MANUAL AND SHOULD BE NOTED ACCORDINGLY. BE CERTAIN TO FAMILIARIZE YOURSELF WITH THESE UPDATES TO PROPERLY DIAGNOSE THE HYDRA-MATIC 4L60-E TRANSMISSION.

DATE OF PRODUCTION CHANGE:

BEGINNING WITH START OF PRODUCTION 1993, HYDRA-MATIC 4L60-E TRANSMISSIONS WERE BUILT WITH THE PRODUCT CHANGES EXPLAINED IN THIS BULLETIN.

SERVICE MANUAL REFERENCE:

FIGURES 1 AND 2 UPDATE THE CHARTS LOCATED IN THE TRANSMISSION DIAGNOSIS SECTION OF THE 1993 SERVICE MANUALS. FIGURES 3-6 ARE CHARTS THAT CAN BE ADDED TO ENHANCE THE 1993 SERVICE MANUAL SECTION 7A-14A.

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER." THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS OCCURRING 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 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.

COPYRIGHT 1992, GM POWERTRAIN DIVISION. GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.