How would you guys pursue a THM400 restoration?

[TexasTon]

I've had two, both wouldn't come close to locking up. Back in the day (1970) a THM400 in an L78 with that convertor was considered a minimum of .50 slower than a stick car, if not more and the MPH was down a bunch. Took many years to figure out it was the convertor, a stock convertor made a horse out of them.

If you want to retain the six bolt convertor, I think I would send it to a good convertor company and have them tune it----I suppose that is possible, I am still a stick guy myself.