INFO ON NEW OIL PAN ASSEMBLY WITH DRAIN PLUG(4L80E/4L80EHD)

SUBJECT: INFORMATION ON NEW OIL PAN ASSEMBLY WITH DRAIN PLUG MODELS: 1992 G-VAN WITH HYDRAMATIC 4L80E/4L80-EHD TRANSMISSION

Some HYDRA-MATIC 4L80E/4L80-EHD transmissions will have a new pan assembly with a drain plug. This design allows drainage of transmission fluid without removing the bottom pan and is a result of customer requests for improved serviceability.

The new torque specification for the drain plug is 25 lb. ft. (34 N.m ).

Date of Production (Figures 1 and 2):

Starting October 8, 1991 (Julian Date 281) all 1992 AFP, MHP, and MPP HYDRA-MATIC 4L80E/ 4L80-EHD models were built with the new oil pan assembly.

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.