904 (lockup) converter question

I have sent out one request for info.Thought maybe someone here had done it and would share their experience.

I have a 3400 rpm stall converter with a 3-carbon fiber disc lock-up clutch in my 200R4. It's like having a 5th gear in my 4 speed OD automatic. It wasn't cheap, but it is awesome. It was built by Precision of New Hampton Torque Converters.