The only available gearbox is a six-speed manual which serves as the conduit between the engine and the rear 285/40ZR18 Goodyear Eagle F1 Supercar tires. The front rubber measures 255/45ZR18. Even with a curb weight ranging between 3,920 (coupe) and 4,040 lbs. (convertible), those tires face a challenge in translating power to grip, so Ford has added standard stability and traction controls systems as well as a limited slip differential. When things get hairy and slower speeds are in order, an antilock braking system works with Brembo vented discs measuring 356 mm up front and 300 mm out back work to cut speed.