have a chat with the guys at 'Rigoli racing' or 'RPI'
you may need dog-gears which will fit inside standard casing
- it's the torque that does the damage
buying / shipping a gearbox and parts from here in the UK would be expensive
good luck

you may need dog-gears which will fit inside standard casing
- it's the torque that does the damage
buying / shipping a gearbox and parts from here in the UK would be expensive
good luck