NO REVERSE/NEUTRAL-125/125C DELAYED REVERSE REPAIR PROC.

Models Affected: 1980 Thru 1983 Skylarks, Skyhawks and Centurys Epuipped with THM 125 or THM 125 C Transmissions

To correct subject conditions on some subject cars, two changes in the law and reverse clutch assembly (Fig. 5) have been introduced. The low and reverse piston assembly is produced with a third design lip seal retainer (Fig. 1). An oil displacement insert (Fig. 2) has been added to the low and reverse clutch assembly. This insert displaces oil and quickens the apply of the low and reverse clutch.

When servicing any 1980 thru 1983 THM 125/125C transaxle for a no reverse or a neutral to reverse delayed engagement, refer to the following chart.

Type of Law and Condition Reverse Clutch Asm. Correction

No reverse (Lip Seal First Design Replace the low and reverse Retainer has separated (Figure 3) clutch assembly with Service from the low and reverse Package #8653915. Also add piston assembly) or the oil displacement insert delayed neutral to reverse (part number 8643490). engagement.

No reverse (Lip Seal Second Design Replace the second design Retainer has separated (Figure 4) low and reverse piston with from low and reverse a third design low and piston assembly) reverse piston (part #8653916)

Neutral to Reverse Second Design Add the oil displacement Delayed Engagement (Figure 4) insert (part #8643490) to the low and reverse clutch 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.