I haven't tried to put it in neutral while driving yet...I will check that out. There doesn't seem to be any vibration, but it is one of those quirky things that bugs the heck out of me. I suppose if bad goes to worse I will have to re-check the spacing on the flexplate to converter.

Are the converters and driveshafts typically balanced to be installed in any orientation, or is there some alignment that I am not aware of?