Motor choice rc10t2

[Sneeck]

I recently picked up one of these thing's for fun. It look's awesome, and should handle well. My original plan was to stick a c50 @ 8 cell's in there, but it won't fit (big shocker) unless I take off the motor quard plate, which I would rather not.

Now I got a 9l sitting here doing nothing, so that might go in. But i'm pretty certain that I won't get a 48 pitch pinion on a 5mm shaft unless it's a pretty big pinion. And thought's about this? 32 pitch gear's mayb?

And my second consern is the driveshaft's. They don't look all that strong to me. The tranny itself has only 1 plastic gear, the rest are steel so that will handle a 9l no problem me think's. But i'm worried about the cvd's. Is a 9l overkill and should I better look for a 9s or would it do fine?

Any help would be grately apreciated.