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

This transmission is a 68 904 and the converter was a used "know" good converter. The engine was a 98 360 magnum from a dodge ram. I rebuilt the transmission over the course or 3 days, watching and rewathcing instructional videos and i felt like i did it right but that could be the problem as well. It goes into all gears without issue. Do you suppose that if the converter was bad it wouldnt shift at all or in the correct way because it isnt converting the torque like its supposed to? Ive got it back out again, im sending to someone to have it looked over, if its good than ill have to look at the transmission next.

Jake
Without cutting a converter open, there is no KNOWN way if a used converter is good or not. Yes you can stick an input shaft in it to see if the sprag rotates one way or both ways, and yes if YOU'VE driven a car with said converter in it and it functioned fine then, then it should be fine, otherwise it falls into the "just another used converter" category.