You cant change the gear box settings! (F1 2014 rules says that cannot change gear box setting only on Australia, and one more final time in Spa) But in this game you only get in the Quick setup the option to choose between Dry option or Wet option, if you move it to Dry it will give higher gear box ratio and if you move it to Wet it will give you lower gear box ratio) BUT this option is meant for wins setups, if you choose setup for a wet conditions it will raise the wins more aerodynamics .