Sorry, forgot to mention what I even have. A Base 2014 Automatic with the standard 3.73 gears..
Do you mean that you have 2.73's??.....As there is no such OEM Option for an Automatic Mustang with a set of 3.73
Gears, Not even with a GT Auto, as I believe that 3.31's are the numerically Highest rear diff gears offered on a V6 Performance Pack, and thats Only available with a Manual Tranny....
I believe the highest Rear Gears for the Auto equipped Stang. is the 3.15