INFORMATION ON NEW SOLENOID ASSY. (IMPROVED DURABILITY)

Subject: NEW SOLENOID ASSEMBLIES TO IMPROVE DURABILITY

Model and Year: 1991-92 C/K AND P TRUCKS AND G VANS

TRANSMISSION APPLICATIONS: SUBJECT: 1991 & 1992 HYDRA-MATIC New Solenoid Assemblies 4L80-E/4L80-EHD (To Improve Durability)

TRANSMISSION MODELS: VEHICLE APPLICATIONS: All Models C/K and P - Trucks G - Van

All HYDRA-MATIC 4L80-E/4L80-EHD solenoids have been changed to incorporate reversible diaphragms, increased coil wire size and inlet filter screens within the Solenoids. Solenoid "A" was Blue and is now Gray. Solenoid "B" was Red and is now Green. This improves the durability and manufacturing process.

PRODUCTION DATE: (Figure 1) Starting February 17, 1992 (Julian Date 048) all HYDRA-MATIC 4L80-E/4L80-EHD transmissions were built with the new solenoid assemblies.

SERVICE PROCEDURE:

The new solenoids are serviced for all 1991 and 1992 4L80-E/4L80-EHD applications.

SERVICE PARTS INFORMATION: 8683081 1-2 Shift Solenoid (Gray) 8683082 2-3 Shift Solenoid (Green)

Parts are currently available from GMSPO.

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.