No, all automatic GTs are 3.15 from the factory. The GT500 dropped to 3.31 gears in 2013.
Heck the '13 GT-500 can do up to 62MPH in 1st gear, sucker is crazy but must be awful in traffic lol. And alright, wasn't sure. I almost bought a premium GT convertible but I wanted it in automatic, but Ford just uses weird plus and minus buttons on the shifter, no paddles\slap stick, so manual was the only option for me. Also I think my SRT-8 Challenger had 4.10 gearing.
Which is why I was like if I'm going to go manual it's gonna be a GT-500. Aside from the annoying 1-2 shift that all of them have, loving the change.