Good Morning folks. Hope you all had a happy and safe new year!

I'm reaching out to you guys to see if I can get some help.

I have a 2014 Ford Mustang GT (5.0 with 3:73 rear) with 44k miles currently and have been noticing (recently) that when I back off the throttle and (especially) pop it in neutral (around 30-40 mph) while coasting I hear a whine and slight groaning from the back end. I asked my wife to listen and she said she really doesn't hear it (outside of the "normal" Mustang...

Bad diff, warranty issue? Need help please!