It's possible that the click resulted from the loose converter bolt; more so if the flexplate is cracked. With the engine off, use a bright flashlight and peer up all around the flexplate. Look for rust tracks and cracks across the face of the flexplate. Take your time and look carefully. Flexplate cracks generally develop sub-concentric with the crankshaft flange and can be difficult to see. You may need to remove the three bolts clamping the torque converter to the flexplate and slide the torque converter all the way rearward, which should provide a 1" - 1.25" gap through which to view upward toward the center of the flexplate. Use a flywheel spanner to rotate the ring gear a few degrees at a time as you inspect for cracks.