High pitch squealing/chirping at around 2000rpm

[Blake Wiehe]

2004 GMC Sierra 1500 LM7 5.3L 4x4

 

I'm getting a high pitched squeal at around 2000 rpm, especially when the truck is cold. I'm wondering if anyone else has experienced this or knows what the issue is. Not sure if it's related, but my knock sensors were recently replaced.

Edited October 25, 2021 by Blake Wiehe
Included vehicle information

[Snowcamo]

Alternator, water pump, vacuum pump. A mechanics stethoscope will help narrow it down. Harbor freight or auto parts stores sell them cheap. And check the belts

Edited October 25, 2021 by Snowcamo