TRANSMISSION FINAL DRIVE UNIT DIFFICULT TO REMOVE THM 325-4L

MODELS AFFECTED: ALL MODELS EQUIPPED WITH THM 325-4L TRANSMISSIONS

You may experience a condition where the final drive pinion shaft may be seized to the transmission output shaft, preventing removal of the final drive from the transmission. This condition may possibly result from heat build-up due to a seized inner pinion bearing. It is also possible the governor gear may be damaged when this condition exists.

To remove the final drive when this condition exists, first remove the transmission and final drive from the car as an assembly. Disassemble the transmission and remove output shaft retaining ring. The final drive may then be removed with the output shaft.

If component separation is attempted with pry bars, the transmission case will be damaged.

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.