had the same problem....Nissan replaced the transmission free of charge....
my tech told me it is the shaft and through out bearing....Nissan said no repair can be made so they replaced the transmission.....problem started aprox 11k .....
z cars are famous for shitty through out bearings dating all the way back to my 1970 240z....
tell your service tech to replace transmission....Nissan is very aware of the issues..
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what happens when you drive a GT3 and the economy tanks you buy a 370z sport touring
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