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I agree. You've tried just about everything else.:ditto:

From what my old ears can hear in the video, it sounds like something is loose and rattling. As wrenchturner stated, start checking for loose items. I have had rattles in my deuce that have driven me up a wall, one was a copper airline rattling against the fire wall. No noise at idle, but once...

Definitely check your transfer case oil. If you have a magnetic drain plug it will be covered with metallic particles.