Q. about gearing, and some more questions

[suicideneil]

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There must be some where to get 6mm mod1 pinions nearby europe ? do rcm sell this ?
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can rcm-shop please post high detail images, and specifications of the slipperential ?

6mm pinions arent very common, but they do exist:

http://204.186.93.64/PinionsMod1.htm

You could also drill out a 5mm bore pinion if you have a lathe, or there is always http://www.sdp-si.com/ who can custom make pinion gears.

Detailed diagrams of the slipperential arent available due to scumbags copying the design and selling it from China ( they actually bought one and then reverse engineered it, but all the same ). There is a forum section explaining how it works though if that helps: http://www.rc-monster.com/forum/forumdisplay.php?f=45

As for motor & battery choice, it helps alot to know the exact vehicle and what you are trying to achieve with the setup, rather than just working from the known weight and transmission/ differential ratios.