Loud Clunk from 4WD every mile or so.

airhardy

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2011 GMC 2500HD Duramax.
While driving on a snow covered road the other day I would get a loud clunk every mile or so while in 4HI. It sounds like the driveshafts, axles, or transfer case gears are not spinning at the same RPMs and trying to catch up with each other. Has anybody else experienced this?
Thanks for your input.
 
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