One really nice feature of The Donahoe Racing Coil-overs is our internal droop stop. It slows down the energy built up by the spring on compression that unleashes on rebound. Hence no clunk. That is all you are feeling. add some nitrogen and the clunk will be less. Not gone but less. hope that helpsEDM said:I have a set of Kings on my truck right now and when I hit fairly large dips or go over speed bumps I get an annoying cluck from them. It almost sounds like it's the spring doing it. Are all coilovers known for this or just Kings? I talked to my friend who had Camburgs and he said his did the same.