EXACT same noise I had when going from park into reverse. Took it into Nissan, they replaced the ENTIRE driveshaft assembly and rear axle. If you need photos of the work ( labor sheet from Nissan ) , let me know. A week after I bought it back in March (2014) it started happening. Still had powertrain coverage through August so they took care of it. They had it for 4 days. ( 2009 370z Sport/Touring 7AT ) BEFORE I did any mods to it. I'm pretty stoked they gave me that, brand new carbon fiber driveshaft, & rear axle. - I'm guessing new bushings were automatic since they replaced the whole rear axle. Let me know if you need anything ( a labor & parts list of what was done might help you get them to do it for you as well). Good luck. Also my Z only had 22k miles at the time they fixed it.
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Stillen G3's - MotorDyne E370z CBE - MotorDyne ART V3 pipes - Z1 ported intake manifold - Z1 (34) row oil cooler - Zspeed V2 undershroud - 318 WHP (dynapack) 260 TQ after UpRev tuning by XactDyno here in Phoenix -
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