Ultramatic Torque Converter

Posted by Reyman R. Branting On 2015/5/5 21:57:17

My 55 400 has very noticeable vibration between 30 and 40 MPH. It doesn't vibrate when coasting down hill in neutral. That leads me to believe that the torque converter is not properly balanced. The transmission was rebuilt a few hundred miles ago. It did not vibrate then.

The rear U joint was replaced, needlessly as it turned out. I don't' know how to check the front one, and word on the forum is that new ones are unavailable.

Can someone tell me how to check the torque converter for proper balance and how to correct it if out of balance?
Or where to send it to be checked and corrected if necessary?
Or thoughts on what else might be causing the problem?

Thanks in advance for any help.

Bernardi in Pittsburgh