Hey I recently install my coilovers and everything went find and after I took for a test drive I went on my driveway, and I started to here a clunk sound. Please help
Yeah, I bet that something shifted once their was load on the parts. Just go back and re-torque everything. Also make sure the springs are seated properly everywhere.
So you retightened and it's still doing it? If it's low speed I bet one of the springs isn't seated or the end of the coil is hitting the top hat funny. Someone else posted something similar. Perhaps loosening the hat on the offending side and rotating the spring slightly may help?