I have factory 3.73 gears with 2500 miles on them no whine from my 2013 gt brembo. Then I have ford racing 3.31 with 6000 miles on them no whine or noise either. I went tremec magnum and went with 4.10 . I'll do $75 shipped continental US each. Check my seller rating I'm fast shipper and items are as stated. just sold my mt82 and buyer is extremely happy!