What you might want to do to find the noise while in 4wd is see if a friend will help you; get the truck on jackstands (4), put the truck in 4wd, and into gear, running (no beer drinking while doing this)

You can put a mechanic's stethescope or a long screwdriver up against the pumpkin; if things are okay, you should hear the gears spinning smooothly. If it's uneven, you might have to do some more investigating; could be a carrier bearing is on its way out.

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