If it is a "clunking" sound that happens repeatedly during the turn, then
yes, it is likely the CV joint as has been suggested.
However, if it a single "clunk" it could be the coil spring moving in its
perch. Our '99 Windstar has done this since new. Might happen couple of
times a day for a day or two then not happen again for 6 months. Totally
intermittent. The dealer's "fix" was to grease the end of the spring. Didn't
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