I had this clunk fixed at the dealer. They replaced the rear drive shafts and the clunk was gone. That was 4k miles ago. Now it is doing it again. Happens only when I backup or accelerate from a stop - clearly audible when you are parked in a garage. Sounds like there is play in the driveline. I'm afraid it will get worse over time. When I went to a Z meet in VA in August, several other 370Zs made the same noise, but no one there thought it was a big deal. I found this somewhere online:
Clunk
Clunk is a metallic noise heard when an automatic transmission is engaged in Reverse or Drive, or when throttle is applied or released. It is caused by backlash somewhere in the driveline, but not necessarily in the axle.
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