easiest way i found to take gearbox out was as follows:

1) prop out
2) undo exhaust from back of turbo (3 nuts)
3) leave anti roll bar alone!
4) gearbox mount off
5) take gearstick gaitor off and remove 2 13mm nuts to remove gearstick

Once you've done all that the box will have enough room to come over the anti roll bar.