The link above seems to be broken, found this one instead:
http://www.350z-tech.com/zwiki/Service: ... _Rear_Axle
I've just picked up my first 350z and have been disappointed to find a click coming from the rear, actually I'd describe it as clunk like someone has left a screwdriver in a place you can't get too and its rolling bck & forth under breaking and acceleration. In fact it did it while pulling on to my drive which is on a slope!
Karl