My 2008 Yukon Denali has developed an interesting front end noise. It sounds like a coffee pot brewing during slow acceleration. I have put it in neutral and coasted and heard nothing. Also, I have slowly brought up the engine RPM’s to see if it was an engine noise. However, it did not do it then. It leads me to believe that it is in the drive train? Does anyone have experience with their Yukon making this noise?