I finally decided to locate the source of my wierd knock when I would go over bumps the last week or so. I have a Hotchkis rear sway bar installed and sure enough it was the bracket on the drivers side that had broke. I called Hotchkis and they are sending me out a set of updated brakets, now that's what I call great customer service. I just thought I'd share this with you guys.
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i got the FREE brackets to They have great customer service!!

 

i found the same problem last week. but it was my passenger side bracket. i as well am supposed to recieve these free things they call brackets. highly agreed great customer care.

 

How old are your brackets? My sway bar is 4 months old and Im wondering is there is a problem in my future.....................

 

Interesting - I had the same issue on my hotchkis srt-4 swaybar set, but they sent me a set for free ASAP as well. Great customer service indeed!