SHIFT SPEEDS OIL PRESSURE CHARTS AND WIRING DIAGRAMS

Model and Year: 1990 W CAR AND U VAN (LUMINA APV) WITH THM 125C/3T40 TRANSAXLE

TO: ALL CHEVROLET DEALERS

This bulletin covers three early 1990 THM 125C/HYDRA-MATIC 3T40 transaxle models that require new Shift Speed, Oil Pressure Charts and Wiring Diagram information. (Figures 1 and 2).

SERVICE ACTION:

Reference the following information when servicing the models covered in this bulletin. All other instructions and procedures are the same as published in the 1989 7A Section of your Service Manual.

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.