A lot of mis-information posted:
1. 2011 Mustang GT does not have a track pack option. There is a Brembo brake option that includes 19" wheels and summer tires.
2. Auto comes with a 3.15 and no option for a different gear ratio. Fastest/quickest stock time is from an auto.
3. Not aware of a specific test of rear gear comparisons. Stock 0-60 times range from 4.3-4.7.
BTW - when you speak "pull", from a stop or a roll?