SERVICE MANUAL UPDATE - SEC. 7 HYDRA-MATIC 4L60 UNIT REPAIR

********************************************************************* TRANSMISSION APPLICATIONS: SUBJECT: 1993 HYDRA-MATIC 4L60 (MD8) 1993 SECTION 7 HYDRA-MATIC 4L60 TRANSMISSION UNIT REPAIR MANUAL UPDATE -- ACCUMULATOR ASSEMBLY

TRANSMISSION MODELS: VEHICLE APPLICATIONS: ALL B, D, F, Y - CARS S, T - TRUCKS WITH 2.5L **********************************************************************

BULLETIN COVERS:

NEW PRODUCT INFORMATION FOR 1993 HYDRA-MATIC 4L60 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 REPAIR THE 1993 HYDRA-MATIC 4L60 TRANSMISSION.

DATE OF PRODUCTION CHANGE: (FIGURE 10)

BEGINNING WITH START OF PRODUCTION 1993, HYDRA-MATIC 4L60 TRANSMISSIONS WERE BUILT WITH A NEW CALIBRATION THAT ELIMINATES THE 3-4 ACCUMULATOR SPRING (ILL. 54) AND INVERTS THE 1-2 ACCUMULATOR SPRING (ILL. 59) WITH THE 1-2 ACCUMULATOR PISTON (ILL. 61).

SERVICE MANUAL REFERENCE:

UPDATE YOUR 1993 SERVICE MANUAL SECTION 7A-15B TRANSMISSION UNIT REPAIR WITH THE FOLLOWING FOUR (4) PAGES.

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.