Garmon's triple disc torque converter. Took it out of my '07 5.9 with approx 60k miles and 19-20 months. Unit was working great. Took it out to try something new. Over $1300 new.
I'll call Monday and find out exactly. There is less of an rpm drop when it locks than with the stock converter, but I don't remember what the number is. Check back here monday.