Clanks and things out back

BOBz

For the past two weeks I'm hearing alot of metallic clanks from the rear suspension. Mostly on the right, after hitting a depressed area ,pot holes or just a bumpy road. Been to the dealer with no luck so far. They had it on a lift and found nothing loose. This noise is LOUD! My friends say it sounds like a truck going by with alot of ladders in the back. Going back to the dealer next week for a ride with the tech on some rough roads. Sounds like a shock bushing or coil spring damper missing. Told my wife if this continues, I'll just have to trade it in on a GT-R. She said " Whats a GT-R ?, no problem if it's quieter" Yeah, if only... Here's an update on the clank issue; Dlr. looked at the rear coil mount/bushing and concluded that everytime the wheel hits a depression in the road, the coil spring lifts off the bushing and then re-seats upon compression. He duplicated the noise by striking the bottom of the support with a rubber hammer causing the spring to jump. He held the spring with his hand and struck again, and the clank was no more! No rhyme nor reason to this. Any suggestions? I thought of liquid grease or WD40 but it will just wash out in time.