One problem related to transmission noise has been reported for the 2004 Infiniti G35. The most recently reported issues are listed below.
Transmission makes chattering noise as the engine shuts down (only able to hear when the transmission is warmed up and only able to hear it from outside or with the door open. ). Transmission was replaced but the chattering noise still exists. I was told that the problem exists internally in all 6 speed trannys' and the problem can not be attended to unless more people complain.