I have a th350 in my 58 chevy. It has started to seem like it needs fluid. I will put it in gear and it takes a second to kick in. So i added a quart. Well it helped a little but still seem to be slipping. so i checked my level and it seem to be good. Few days later started slipping bad so i added another quart with out checking. That didnt help. Checked level and it was way over full. So drained the damn thing and filled it proper level. BUT still slips, give it gas and it revs high and barley goes but if you ease into it it will go but not that great. SO WHAT IS WRONG WITH THE DAMN THING? Torque converter bad? Trans going out? Any help in this matter would be appreciated.