Cracked flexplate question

When does it vibrate? If it only does it while driving, its most likely the driveline. If it does it in neutral and park, it's probably in the engine or trans area. Something else to check, is the converter could be bad. I had an ATI converter that wasn't balanced correctly. Also had a B&M that had internal issues and the hub was welded on off center. So possibly a different converter might help.