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So I have a really loud and awful sounding squeaking noise coming from my rear suspension. it is happening only when I either go over a large bump, or I accelerate. It is BY FAR worse when accelerating, its almost constant squeaking/metal on metal? screeching sound. I'm having a lot of trouble trying to narrow down what could be causing it because I recently replaced all my bushings with urethane bushings, and replaced the struts. I have tried spraying my bushings with silicone spray, but that doesn't really help. I have tried having a passenger crawl back there and see if they can narrow down the problem area while I was driving but met with no success that way. I've tried taking out all the rear interior and driving with the hatch open but that did nothing. I've tried pulling the driver's side LCA (I'm convinced its on the driver's side... at least mostly) and re-greasing and sanding down the bushings to make them fit better, but that did nothing either. What could be causing a squeak under acceleration? Which bushings should I look at? Is it possible its the springs scraping the spring perch? Is there supposed to be some kind of pad between the two? Its SO BAD when accelerating, even like 1/8th gas it will do it. But cruising and braking it is silent. Any insight would be much appreciated. I apologize if this is in the wrong section, but I figure that since I have a 280z, this issue would be specific to that car, Mods please move if this is in the wrong section.