without tearing motor completely apart does anyone have a clue on this?

flywheel has teeth missing in only 1 spot.
I have taken tranny off and replaced.
but while tranny is off checked rotation and can only turn motor 3/4 of the way around and it freezes up-turn the other way and same thing. I get to that certain point and can't turn the motor
any further.
motor was running fine (no knocks or pings) thought it was touque converter at first but know it's not now.

any suggestions?


motor is FI 302.