ALWAYS USE A MOD SOFTWARE WITH MODIFIED MOTORS!!!!!
The stock software will be too brutal but worse can lead to cooked mod motors due to the way the timing is used.
My gearing is;
2wd 25/78*2.6:1 = 8.112 (could probably go up a tooth on a big track)
4wd 23/78*2.5:1 = 8.478 (again on a big track a 24 is ok).
Be careful with going straight to those gearings though, always temp check the motor at about 2 mins then every min after that the first time you try and run one.
I recently killed my Orion 10.5 by trying to over gear it indoors, was my own fault though as if I had of checked at any point after the initial 2 minutes I'd have certainly stopped it ... was out there for about 10mins before it failed
