Hi guys. I just bought a brand new GMC Sierra 4X4 Ext. cab Nevada Edition with a manual transfer case. When I drive in 4 Hi the front end makes a terrible noise like bad brake pads on a rotor and gets louder as I accelerate. The noise goes away when I shift back into 2 wheel drive. I took it back to the dealer and the mechanic told me that this noise is normal for a manual transfer case (it sure does not sound normal to me). I have never had a 4X4 without the electronic transfer case before so I don't know if there should be a noise. If anyone knows, would you please let me know what should be normal and what should not?