So I have a 2016 3.5 V6 Edge with 91000 miles on it. Its been in the Ford servfice shop 5 times in 3 months to try and find this problem. So far the PTU, rear differential and the rear axel all have been replaced (still under drivetrain warranty). Still making the noise. Dealership said the rear differential was bad and making a noise as well but the replacement did not fix the issue. Anyone have any ideas? I guess they want to tear into transmission next.