You can get gears first but plan on either getting a custom/dyno tune or a custom tune via handheld tuner soon after to properly calibrate your speedo.
When you do "gears" also plan on getting a tlok installed as this will distribute power to both wheels for improved launches and better traction. Expect to pay $300-500 for a solid install. Stick to Ford Racing gears as they been known to mesh the best over Motives.
12 Black GT500 SVT PP l 2.6 Pulley/Idler l Airaid l o/r X l 305 NT555R's l Recaros l
04 Azure Blue Mach 1 / 03 Sonic Blue 3.8 / 14 Sterling Grey F150 FX4 402A 5.0 / 11 GT500 R.I.P.