Weird grinding when TC unlocked??

Hi y’all, so I’ve recently noticed an odd grinding sound like “Ch Ch Ch” when I’ve been coasting and get back on the gas. Only noticeable for a few seconds until torque converter locks up, then it quiets down to barely noticeable at all (maybe when TC is half-locked???) I’m checking my catalytic converter today in case it’s a resonant rattle but I’m a bit concerned. Sounds like a bearing or something rattling faintly, like one of those old fashioned wooden baby rattles. Seems to come from passenger side towards the front, possibly front engine bay. Maybe a pulley or balancer?

Truck is a 2012 4x4 2.7 Auto, 127k miles. 1.7” lift in front, 2” in back

in the video below, you can hear me stabbing the gas repeatedly, causing the noise. Most noticeable around 25 seconds and 35 seconds

https://youtu.be/JQRaR4mp-D0

Thanks!

 

Only noticeable above like 50 mph.