TWO PIECE PARK/LOCK ROD CHANGE NEW ONE PIECE DESIGN-THM200-4R

ONE PIECE PARKING LOCK ROD ASSEMBLY - 1983 THM 200-4R

Beginning in October, 1982, the parking lock rod assembly in 1983 model year THM 200-4R transmissions was changed from a two-piece (Figure 1) to a one-piece assembly (Figure 2).

In servicing the parking rod mechanism on any THM 200-4R, it is important that the correct parts be used. The detent levers and rod assemblies are not interchangeable between the two designs. Refer to the chart below for proper parts usage.

Two-Piece Design One-Piece Design

Rod Assembly - 8639110 Rod and Lever Assembly - 8634991 Lever - Inside Detent - 8634184 (Lever is not supplied separately.)

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.