Center Diff Noise on 4ksq

["Roos, Hans" <Hans.Roos@caere.com>]

Hi All,

I was playing around with the differential locks the other day and while
stopped at a light, car in neutral with the center diff locked, there
was a deep hum and a vibration that is not present when the center
differential isn't locked.  Is this normal?  Also, it seemed to take
quite a while for the diff to unlock, while under way, this was on a
straight piece of road.  Anything to be concerned about? 

-Hans