Friends, I have recently bought 2014 Nissan Maxima, and I have this abnormal sound from gearbox between 80 to 100 km/h speed on automatic transmission and sports mode. And During manual transmission sound comes only when i shift to 6th gear between the same speed range.
What is this sound ? What is the probable cause for this? Can anyone help me with this?

 

under warranty still if it is under 60xxx miles? Next there is NO gears on a CVT transmission, if not under warranty AAmco does a free test!