Welcome to CHR! I'm definitely not a tranny expert, but the first thing that hit me was the 5 quarts of Valvoline Max Life ATF. If you changed out the torque converter you'd have needed a lot more than five quarts to fill your system, IMO. It sounds to me like you ran the system low on fluid, rev'd it up as it got a suction prime and then put a massive pressure surge through the tranny. I'd say that you've got a tranny rebuild in your future, but then again I led this with a disclaimer that I'm not a tranny guy.... Hope I'm wrong.