Thanks for the reply's guys, I just got word back from Nissan of course they did not hear anything and they were trying to charge me a diagnostic fee which i immediately refused. They said it could be my tires which are not a warranty item... They also said they checked all the bearings, but did not explain if they checked the differential bearings so my wife is going to ask if they actually checked the differential not just the wheel bearings. Ya pretty sure tires don't make a high pitched piercing whine only at highway speeds.
Honestly I can deal with the whine as long as I know the differential is operating correctly.
I am going to change the fluid and see if that helps.
Is there an easy way to identify whiteline bushings while the car is lifted?
My buddy works at a shop with a lift so we can use that when replacing the diff fluid.
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