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I haven't encountered this problem on my super duty, but I have on other vehicles. The slip yokes on the super dutys are common issues, but are usually more of a clunk type of thing. But greasing it is free, so it's worth a try in my opinion. It seems like you have pretty much eliminated everything else. I have seen an unbalanced driveshaft crack open a transfer case, so it may be worth the few bucks to take it to a shop and have the balance checked on it.
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2000 F250 Super Duty, 4x4, 7.3, 6 speed manual, 4" straight exhaust, 6637 air filter, superwinch hub locks, zoodad, foil delete, AIH delete, power pedal, autometer gauges, 2.5" leveling kit, 260,000