It's totally normal. If you do a search on this forum, you'll see tons-o-posts about this very thing. The transfer case is gear driven, not chain driven. There, by nature, is a little 'slack' in the gearing and that is what you hear/feel. It is most apparent upon the release of the accelerator, and is most pronounced between 30-70MPH.
Does this describe what you are experiencing? My dealer suggested switching gear lubes from the factory stuff to either Redline or Motul. Apparently this will help reduce the gear whine sounds as well.
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Land Rover-less.
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2006 Infiniti QX56 - Loaded
2002 Discovery II SE - SOLD!
1999 Audi A6 Avant Quattro Tiptronic - Slammed on RS4 18's
1996 Mariah Talari w/350 Mercruiser and Ron Hill Marine Go-fast parts.(Presently in Dry Storage)
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