 Cars now have expendable parts and a gearbox can be changed in twenty minutes.On the long tough rallies of yesteryear drivers had to drive 3000 km exclusively up and down the French Alps, against the clock for most of the way, and look after the gearbox and every other part of the car, since changing them was impossible.Liège-Sofia-Liège, for example, being almost a flat out drive from Belgium to Bulgaria and back, through the roughest roads the length of Yugoslavia and over the difficult passes like the Gavia and the Vivione in Italy.