torque convertor

It would difficult to do while still on the car because you have to be able to get different types of files (round, 1/2 round, etc) and file 90 degrees to the gear teeth to get the new tooth form (shape) as close to the other teeth as possible. You basically have to file/shape it so it's very close to an original tooth, that would be hard to do in the car. Plus you also need to grind off the old tooth to get a good solid weld into the ring. You can also use a die grinder to (rough) shape the tooth then use files to finish the job. Be sure to center the tooth between the adjacent teeth as you shape it. You have nothing to lose because you would have to remove it to replace it anyway????????