Found It.....o.k., just to bring you up to speed. I replaced the rear chunk, bushings, mono spring, shocks, etc...during the winter. Shortly after, this strange noise would come and go. I had it up on the lift yesterday and found the problem. The chunk dust cap on the left side was loose and causing the problem.
Now I have another problem....as it seems during our run to Helen a few short weeks ago, I really worked the wheel bearings. When I was driving home today, I started hearing a clunk sound from the left side of the vehicle. It was almost like a poping sound from the wheel. Anyway, after inspection of the wheel, it's a bearing. I bought replacements a while back but now I need to have them installed. I don't want to drive the vehicle and need to get the assembly off the car. I need to locate a vette professional in the area. If anyone knows of someone in the South West Georgia area, please let me know.
Thanks