Rear end noise

[BK90]

I have a 07 Tahoe LT 2wd. I can hear a rubbing sound from the rear end!Idk what it is but it's driving me insane! Me being an electrician not a got that works on cars that often..? I've replaced the the u joints, the bearings, wheel speed reluctor & it's still makeing the end xc same noise!! Can anyone help me with any other information or ideas thanks!!!!

[flyboyron]

Maybe put the vehicle on a lift or secure jack stands and run the vehicle in drive, and crawl underneath to see exactly where the noise is coming from. A stethoscope may come in handy also.