We swapped out a transmission and afterwards we had a rotational sound which sounded like it was coming from the bell housing. after re-polling the transmission and inspecting the flywheel and torque converter and the plate we did not find anything abnormal. we then started the motor without the transmission and still heard the noise. As you can see in the video it was the timing chain having play and slapping against the cover.
![](https://i.ytimg.com/vi/N-zVI4SKIvM/maxresdefault.jpg)