Nice truck man :) I am wondering how much it weighs? Mine is heavy as - bout 7.4Kg, but i am running 18 gp3700 nimh cells....
The pinion gears on mine can be changed by unscrewing them - same as with when it was nitro, and if you have a fellow who can make larger hardened gears (which i also have - 2+/4+ & 6+) - Mr Constructor (the fellow who created my beast), i'm sure would be more than happy to help if you have any q's :)
http://forums.radiocontrolzone.com/m...p?userid=29212 - or i think you can try here too....
http://www.ace-cars.info/Ace%20Cars/...%20Adress.html
One thing i just thought tho - is that motor mount adjustable at all???
I run a lehner 2230, and not sure on your shaft size you will have there.... i'm sure serum will know tho :) The truck looks to run great in the video.... i need to go lipo too, so i can get rid of some weight, but i'm too pov atm hehehe :)
almost forgot - here's a pic of the pinion situation.... basically is secured with a set screw to mount to the motor shaft :)