THM 325-4L TRANS OIL PAN LEAKS NEW ACCUMULATOR HOUSING

MODELS AFFECTED: ALL 1982 AND 1983 THM 325-4L TRANSMISSIONS - ALL MODELS

Some 1982 and 1983 THM 325-4L transmissions may exhibit a transmission oil pan leak which is caused by an interference between the accumulator housing and the transmission oil pan.

Beginning late in March, 1983, all THM 325-4L transmissions were produced using a new accumulator housing (Figure #1) to correct the interference condition.

When servicing any 1982 or 1983 THM 325-4L transmission for an oil pan leak, inspect for interference with the accumulator housing (Figure #2). If an interference exists with the accumulator housing, remove it and grind, or file a portion of the casting boss (Figure #2 Inset). When removing this material, use caution to avoid damaging the cup plug. Remove only a minimum amount of material to eliminate the interference with the transmission oil pan.

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.