2000 gmc sierra 2500 6.0 4x4
 

Hi I have some kind of dash noise. It stops when the truck is at a full stop, starts back up when I’m accelerating. Then there’s some kind of grinding noise mechanic said he couldn’t hear it but I can. I’ll attach videos of each noise. Any help is greatly appreciated

videos aren’t uploading. Dash noise sounds like zip ties on a rear diff slapping😂 i don’t know how to explain the other noise almost like grinding