Here are some cheats and tips for the game F-1 World Grand Prix 2.
7-speed transmission in Grand Prix mode:
Select single race mode and choose M. Schumacher or E. Irvine as a driver. Select a
manual transmission. When the race begins, change gears until getting to 7th gear.
Quit the race, and enter Grand Prix mode. Start or resume a season and any car you
select will have a 7-speed transmission.