vibration problem

I finally had a chance to tear into my tranny. Mine is a TF A904 and has a ball bearing (National p/n 206-LOE) in the extension housing that is about 1/2 way along the output shaft. This means there's lots of cantilevered output shaft after the bearing. Doesn't seem like a good idea to me, but that's the way they are. That ball bearing on mine was totally shot. The outer race could almost fall off the inner race when I took it out. The new bearing is like night and day difference. The car is smooth at highway speeds now. That's one more I can scratch off my list.