I have a new reinforced subframe in my car and I too have a creak. I can not cause the creak by pushing down on the fenders. I seem to hear it mostly on bad road surfaces. I think it is the poly sway bar bushings, they came with a grease, which I used, but if it only lasts a month or so before the squeeks come back I will try to find a 13/16" dia. bushing in regular rubber material.
What sway bar bushings do you have?
