Maybe the strut mounts if they wernt replaced with the new struts. Mine does the same thing has a thunk in the right front when ever I hit a pot hole or bump. And I think I've narrowed it down to a worn out strut mount. The struts still ride fine so I'm planning on just replacing the mount and see if that fixes it. Rockauto has the Motorcraft mounts for $30. Figure I'll try the cheapest fix first.