Thanks for all the tips, I had the front diff checked it is good. In fact, the transfer, transmission and rear diff seems to all be in good working condition as well. One thing I didn't mention is I had the Rear main seal replaced in april maybe this will help. The noise is still there, at speed whe...

I have a 2007 Cadillac Escalade EXT with the 6.2, 124150 miles At speeds of 50mph and high there is a type of vibration noise centered in the middle front of the vehicle from inside. It can't be heard at idle or from the outside as much as I can tell, but while driving it comes when on the throttle ...