Just out of curiosity more than any thing, is it right that VW didnt make 5 speed gear boxes for the air cooled as the fan wouldnt fun fast enough for cooling at the higher speeds? if that is the case couldnt you add supplimentry cooling and run with a 5 speed box? is such a thing availiable? If you were going to fit a modern engine like a scooby lump or one of the diesel enges some people fit, can you get 5 speed gear boxes for them which you could use on a bus ??