The 1993 HYDRA-MATIC 4L80-E/4L80-EHD Service Replacement Transmission Assembly (SRTA) core return program has changed. All cores are to be returned to GM Powertrain Ypsilanti site for root cause analysis.
Units should be returned by Emery air freight. SRTA models can continue to be ordered for all 1993 HYDRA-MATIC 4L80-E/4L80-EHD model applications from your local General Motors Service Parts Operation (GMSPO) Distribution Center.
Ship the transmission via EMERY AIR FREIGHT to:
GM Powertrain Division General Motors Corporation Willow Run Plant-Quality Assurance Garage Ecorse and Tyler Roads Ypsilanti, MI 48198-6198
Shipping charges will be Collect Freight Billing to the above.
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.