Need help with 1st BL setup in Emaxx!!

[Serum]

Welcome!

about your q's;

1 yes, it uses the standard 25mm hole distance, and bolts up right onto the stock plate, and the stock spur uses a 32 pitch pinion.
2 That depends on your drivestyle. If you have got a gentle finger, the stock spur can last forever. if you like to bash and drive it like an on/off switch, it's wise to upgrade to a strobe slipper with MOD1 gears (both spur and pinion)
3 that depends on the speed you want to do. Check the sticky in the brushless section; if you go to the post of BrianG you'll see the speed calculator, and you can calculate the gearing you want.

A stock maxx has got a few flaws; the input gears are put onto the shaft with a hollow pin; replace this pin with a hardened nail or something, the hollow pin will break sooner or later. Another weak flaw; the idlers; replace them with steel ones. The stock driveshafts are rather weak too. but my advice is; drive it till you break it; except for the diffs; i recommend using the new 3.3 housings (they use a 4 instead of 2 screw design) and FLM diffcups with M3 screws.

But if you drive it careful, the stock maxx can last quite a while! but the first upgrades are steel idlers and the input shafts mod.