There was some talk in finnish Facebook-group about converting old 0/1-series hub reduction axle to direct drive axle by removing hub reduction and fitting a hub from some Scania 6x4 axle. That way you went from about 2000 rpm at 80 km/h to about 1450 rpm/80 km/h, and if engine rpm was raised to 3000 or more you got 160+ km/h topspeed…
Was that very popular in UK ? In Finland I know many that did it.