I own a 2003  F350 7.3L and i to have that clunk but only like you said turning at highway speeds.
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2003  F-350 Lariat 7.3L Powerstroke V8 Turbo Diesel. Ball Bearing Turbo, Superchips, 5'' BullyDog Exhaust, Billet grill, EGT and Turbo gauges, XM Satellite Radio, 150,000mi and counting!!!!
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