dino456gt

have an 05 auto with 50k miles. While idling (park, neutral, drive) I have a rattling noise that Chevy thought would be torque tube bearings. I read the post's a dropped the drive line myself. When I spin the shaft in the t/tube it's quiet and feels smooth. I have the shaft out of the housing and the couplers are fine. Also took the flexplate to check for cracks, etc and found nothing obvious.

Any ideas? Help!