I have both a 2004 and 2006 and both had the clunk before I replaced the sway bar. Do it, aI guarantee you, it’s your problem. It’s not hard to do either, if you follow the procedure in the Rave Manual. The first time you do it, it helps to have someone help guide the new one in during installation.My only other guess would be the sway bar bushings.
Dont forget to order new A frame bolts, as they are torqued and then stretched, so they shouldn’t be reused.