The noise in the video is coming from inside the bell housing. I took of the dust cover and rocked the truck back and forth in neutral. I can hear a noise from inside the truck that sounds like a growling noise, that only happens when the truck is in gear. Checked the flex plate for any cracks through crank rotation and also the bolts. Everything there is good. Whatever this is, is on the output side of the torque convert. I took the truck to a trans shop and they said it doesnt feel like a trans issue nor does it specifically sound like one. Anyone who can possible diagnose please help!!