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stupid question, but...
I know this may be a stupid question, but is your air conditioning compressor kicking in? On AWD vehicles, this can cause major changes in engine torque which can cause the transfer case to change from engage to slip to engage. Just wondering, sometimes we miss the obvious! Turn all of the air controls to warm, run the blower fan, and TURN OFF THE DEFOG/DEFROST. Did it stop?
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