If you can't find an obvious problem in the usual suspects, I would guess the shock would be your best bet from what you describe. Though I would think it would be something obvious if you can feel it in the floor board. Good luck. -Staten Island Frank- In a message dated 8/17/2009 4:46:34 P.M. Eastern Daylight Time, Brian.Mongar@xxxxxxxxxxx writes: It clunks on bumps, almost like the shock is broken, they are only about a month old and have 2500 miles on them. I don't think that's it... But I have installed defective parts before.