Elite have developed a 3 speed gear kit for Grasstrack/Autocross use that fits into the Hayabusa 6 speed gearbox.
The kit comes with new gears & output shaft.
It is designed to fit into a standard case with no modifications required.
Ultra tough construction for rough terrain, gears are REM super finished increasing life and reducing friction. This results in core strength of approximately 30% greater than most manufactured gears.