I had the same issue on my 350z. Exactly as the OP described it. My diff was moving up and down in the hole where it bolts to the subframe. Just very minor up and down movement that was making a lot of noise. I stuck a washer in there and tightend the bolt back up and it went away. I discovered it by letting a friend drive around a parking lot and I was sitting in the back of the Z with the hatch open, hanging over the rear looking at the suspension while we were moving lol.
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2009 370z touring w/sports package
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