New 2014 silverado Loud noise when on auto 4x4

[Spiros1969]

When I accelerating and releasing the pedal when I'm on auto 4x4 theirs humming or grinding noises, it gets louder inside , when I switch it back on 2 wd the noise stops,when I first bought it, it didn't make these noises only 1000 miles

[gmtech4]

warranty

[scott19677]

Mine does this to. This is my first 4x4.When I asked the dealer,I was told this was normal. I am thinking this is B.S.

[fondupot]

its the sound of the transfer case and front differential being engaged. Some "rotational" noise is to be expected, but if its grinding then something is going on with the 4wd system. Take it in and have them look at it.

[marvelousque]

Any resolution to this issue for anyone?

[seasled]

You don't drive in 4auto in dry conditions, only wet slippery weather! Keep doing that and you will need to replace the t case

[VMaxtastic]

I'm guessing you are doing this on dry pavement......