i have the same problem on my alero. I put intrax springs on sensatrac struts and i have the same rattle in the rear. I did all the work myself too installing the springs and struts and doin the alignment since i work at a dealership. It seems to me they rattle because my rear springs don't have the rubber insulators on the bottom of the springs like the fronts do. i'm not sure if u could put some kind of rubber insulator underneath the spring to fix the problem.
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