What does “On his gearbox” mean?

F1F1 is the pinnacle of open wheel,  single seater car racing and arguably the highest level of any motorsport globally.... There's more... drivers sit in front of the power unitF1 cars no longer have engines as such, they run a hybrid power unit (PU) that delivers in the order... There's more... which has its gearboxF1 cars use an 8-gear, sequential automatic transmission, meaning that there is a clutch, but no clutch pedal. The clutch... There's more... attached at the very rear of the car. As such, it is susceptible to damage if hit from behind or if the driverOK, so we all know what the driver is, right. I've always liked the description that F1 drivers are like... There's more... slides backwards into something solid.

When a driver is close behind the car in front it is often said that he is sitting “on his gearbox”.