My 2008 convertible has a squeak at the rear when going over bumps and it doesn't matter if the top is up or down (it is down MOST of the time). It sounds like suspension bushings but I can't verify that. I sprayed some WD40 on the drivers side bushings but that didn't help. Anyone else run into this issue?

 

Please take no offense if this seems dumb, but I have read a couple of other posts from others about the back of the front seat squeaking against the front of the back seat. Might be worth checking out if the front seats are all the way back....

 

I did a search and read the same posts but that is not the case with mine.