whirring low noise hum at idle and under 30mph - SOLVED

[Angelo217]

hey just picked up another 06 Tahoe, this one is a z71. I have another 2006 Tahoe and it does not make this noise.
Im fixing to take this one on a 1,200 mi road trip after I finish diagnosing everything but there is one point of concern and I have no idea what it is.

I seemed to not have noticed it at first but when idling there is this lower end hum, whirring, weird noise. almost maybe sounds like a bearing on its way out, but it seems its coming from under the car, kinda near the back end of the motor is what it seems to me. if anyone has any intel or things to look into on this it would be much appreciated thank you.

 

[Big Mama]

Have you checked the T case and front diff fluid?

 

[Angelo217]

Have you checked the T case and front diff fluid?

It ended up being the water pump btw that was causing the whirring noise, sucker blew out on me a few weeks ago. Cooling system is basically totally rebuilt

 

[Big Mama]

Thanks for closing the loop for the next guy.