Front end clunk

[lcarleton]

Just purchased a 2004 3500 4x4 with 42k and have a clunk in the front end while pulling ahead with wheel at lock , right or left. Does not do it all of the time. Taken to the dealer twice. They changesd out the top ball joints on both sides the first time. Not a fix! Changes the right lower control arm the second time. Still no fix. Anybody have a suggestion what to look for next?

Thanks,

Lance Carleton