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

SUBJECT: SERVICE MANUAL UPDATE - SECTION 7 HYDRA-MATIC 4L60-E AUTOMATIC TRANSMISSION DIAGNOSIS

VEHICLES AFFECTED: 1993 "C/K, S/T" TRUCKS AND "M/L, G" VAN

APPLICATIONS:

------------ C/K - TRUCKS UNDER 8600 GVW

S/T - TRUCKS WITH 4.3L NON TURBO

M/L AND G VANS

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 that may occur 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 that 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.