NEW THIRD OIL PRESSURE SWITCH 200C TRANS-NOT INTERCHANGEABLE

VEHICLES AFFECTED: 1984 'B' and 'G' Series Vehicles Equipped With THM 200-C Transmissions (Code OI)

Beginning November 1st 1983 a new third oil pressure switch and bracket assembly (Figure 1) went into production for all 1984 THM 200-C OI Model transmissions.

When servicing any 1984 THM 200-C OI Model transmission that necessitates that the third oil pressure switch be replaced compare the oil pressure switch being replaced to the past and new oil switches in figure number 1.

If the oil switch required is the past switch order part number 8634475.

If the oil switch required is the new switch order part number 8648190.

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.