INFORMATION ON NEW SOLENOID ASSY. (IMPROVED DURABILITY)

SUBJECT: INFORMATION ON NEW SOLENOID ASSEMBLIES TO IMPROVE DURABILITY

MODELS: 1991-92 C/K, P AND G VEHICLES

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

Part Number Description ----------- ----------- 8683081 1-2 Shift Solenoid (Gray 8683082 2-3 Shift Solenoid (Green)

Parts are expected to be available on 4/6/92. In case of limited inventory, parts will be placed on 400 control to waive V.I.P surcharges. Only verifi- able emergency V.I.P orders will be accepted. GMSPO will make every effort to obtain parts. However, the part will be shipped premium transportation at dealer's expense and all other order types will be placed on backorder until the 400 control is removed.

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.