On Fords you normally have to hold the button down for 3-5 seconds to force a shutoff while moving and shift in to neutral and holding down again will re-start it. They never shut off with one button press, you have to be deliberate.
Just read this from C&D blog
http://blog.caranddriver.com/2015-ford-mustang-everything-you-need-to-know-about-its-v-6-v-8-and-ecoboost-engines/
"Ford’s in-house final drive was also reworked, with the company fitting 9.8-inch differential internals in an 8.8-inch-sized unit with a stiffer ring...
This is from media.ford.com
It would be strange to have aluminum axle pieces on the GT and not the auto when they've stated only the autos would get a aluminum casing.
Yeah maybe you could make that argument for drag racing the car...but on road courses or in my case autocross the less you have to shift the faster you'll be, the powerband means EVERYTHING.
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1. Currently driving my Fiesta 5spd through college
2. I have only owned one non domestic vehicle that was given to me at 16...I have since owned 7 Fords
3. Before getting married I had an '08 S197 GT 5spd