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Message: <blockquote data-quote="PoManNox" data-source="post: 29734" data-attributes="member: 8300">It could be the transfer case, could be the rear coupling, or it could be anything along the driveshaft, like a carrier bearing, etc.One way to troubleshoot the rear coupling is to unplug the electrical connector to it, pull the AWD fuse or remove the prop shaft and drive it to see if the problems go away.   It's not uncommon to have the non-serviceable bearings go bad in the rear carrier/coupling.   The coupling itself is an electromagnetic clutch.If the noise is still present with the AWD system disabled by pulling a fuse or removing the prop shaft to the rear, the problem is probably in the rear differential or transfer case towards the front of the vehicle.</blockquote>