My rear was whining like crazy from day one. Blew the pinion seal. Ford replaced the ring n pinion, pinion bearing and seal. ring and pinion were installed wrong. I imagine the friction caused heat, which means higher pressures, which means blown seals.
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2013 Mustang GT w/ Track Pack - Steeda Ultralite Springs, Koni Str.t Struts/Shocks, BMR LCA & Relocation Brackets, BMR Adjustable UCA and Bracket, BMR Adjustable Panhard, DSS Aluminum Driveshaft, Bassani x-pipe and catback, MGW shifter, JLT CAI, Steeda Tune