Chevrolet front differential noises

B. day.
I have a 4x4 colored chevrolet, it presents noise like a buller, some say that it is the differential other that is the date that reaches the front differential.
Diagnosis ......
When walking Sumba, the truck is neutralized and continues to sow.
Someone who recommends me to do, lower Tranfer and date or disassembled wheel.
Thank you very much ..... Salu2

If the noise persists when you are not rolling, it is difficult to be a downtown, the most caused thing is that it is a box or transfer, but you can check if when the clutch the noise disappears then it is box or transfer.

UPS .... The truck is 4x4 automatic, 4x4 selector is electronic, ????
Like there .... ???
What do you recommend ... ???
Thank you

Cueck now if it gets more complicated because you could have problems with the torque combicer, the best would be to cause it to listen and feel it, you should take it to a workshop to be safe at one hundred percent