2012 PPV..Grinding/knocking sound from transmission area when cold

[kronus]

My Tahoe has been making this odd sound when I first start it in the morning. It's hard to describe, so I've attached two videos (please ignore the noisy AC compressor). To me it sounds like something is loose/knocking around in the transmission, and it only occurs on cold starts. Anyone have ideas what it could be? I've looked around while it's making the noise and nothing external that I can see is loose.

First video is a little hard to make out the noise, but in the second video it is quite obvious.

 

[89Suburban]

Says videos are private.

 

[kronus]

Says videos are private.

Ah sorry, try that now.

 

[89Suburban]

All I hear is cam and exhaust lol good looking rig. Hopefully somebody can identify it better.

 

[kronus]

All I hear is cam and exhaust lol good looking rig. Hopefully somebody can identify it better.

It’s actually on the stock exhaust and cam, but thank you for the compliment haha.