new converter problems,

My opinion, is that I would not chance the converter hub in a rebuilt transmission. A friend of mine just went through this, had a leak at the front of the transmission so he removed it. The hub of the converter was scored, and the front pump bushing was bad. He sent the converter out to the manufacturer, they cut it apart and found some issues. They repaired the converter and polished the hub. He reinstalled it and it leaked. I measured a hub I have in my garage from a used converter, and his measured less. Took it back apart, sent the converter to another place and they found some more issues. So he bought a converter from the second place, installed it and no leaks.