so my car gets this vibration at part throttle at about 20-35 mph and i think 45-50 or so just before it upshifts, and sometimes when I put it in gear the car dies. IT starts just fine and idles fine and at WOT everything seems to smooth out. I've heard that sometimes lock up converters start to chatter when the clutches or whatever start to go bad .Is this possibly my tc going bad?

P.S. forgot to mention sometimes the car acts like it just wants to pull away at idle and sometimes it hesitates to move when I give it gas.

 

really none of the tranny gurus can give me a yes or no answer?