2 speed transmissions are perfectly legal in off road, whether it gives an advantage in off road is another matter. The PB Mustangs ran with 2 speeds and they still got beat by the CAT.
They are banned in touring cars, highly likely because when they formulated the rules HPI had a 2 speed gearbox on the RS4 and it was likely that every manufacturer would need to make a gearbox for their cars.
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