Beginning mid-June, 1981, all THM 125 and 125C transmissions are being built with a new design band anchor plug P/N 8637640. The new design band anchor plug has a tab which holds the part in place. See Figure 1.
SERVICE INFORMATION
1. Transmissions built with the past design band anchor plug required a staking operation to hold the part in place. See Figure 2. This staking operation is not required with the new design band anchor plug as it is held in place by the reverse oil pipe. See Figure 3.
2. To remove or replace the new design band anchor plug the reverse oil pipe must be removed.
3. For service use the new design band anchor plug Part Number 8637640.
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.