What does a bad torque converter feel like, symptoms??

I attempted to take it for a spin and it drove like ****, wouldnt shift and had zero power so that leads me to believe it has to be the converter.

If the engine tune is known to be good, and if the rear end is anything but 2.45 or less,and it's a non loc-up; Then it sure sounds like there is no torque multiplication going on in that TC

But before you yank it, this problem could be as simple as the tranny being stuck in 3rd gear,lol.