all you need is a 5mm 32p pinon. I like novak and castle pinons, but Robinson Racing makes good ones as well called the absolute. the gears may also be called mod .8.
Nothing is needed to be done to the plate. If you have a center diff it needs to be replaced with the slipper and you need to run it very tight.
I am assuming you are going to run a 4s. If so you need the traxxas battery expansion kit. http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXUVZ8
With that you will be able to run a 4s battery or two 2s packs. I use that kit to run a single 2s 10000mah battery(same size as a 4s) and works great.
If your running a Mamba Monster esc or the hpi re-branded MM traxxas makes a Mamba Monster mount.