The MP4/6 raced throughout with a manual "H" pattern gearbox. A semi-automatic transmission was tested during the season (and shown at the Hungarian Grand Prix; the car equipped with it ran 4 laps on track in practice before Senna spun off; the car was then converted back to a manual) but was never regarded as good enough to be used in a race; Ferrari and Williams were the only teams to use semi-automatic gearboxes during 1991. The MP4/6 would go down as the last Formula One car to win a World Championship using a manual transmission or a V12 engine.