What parts are need to get my e-maxx BL?

[A RC Dude]

i know it's going to take a LOT of money but i'm planning on making my stock e-maxx Brushless. and after a bit of looking and talking to some ppl on another forum i think it's posible i plan on getting a 8XL motor9suggested by BOR, aka BlackedOutRevo) and my rustler allready has a Mambamax system in it so i'll use that ESC(i'll probably use velcro or something to be able to move it back and forth), or at least till i can get another one. I also will be using 2, 6 cell NiMh batts sence i only have one 2s trackpower and i will not have enough money to get another and buy all the nessesary stuff for the car.
Man, when i first got my rustler brushless, i dreamed of a BL e-maxx but i never thought i'd ever get enough money to do so.

So i have a few questions about some of the parts needed to make it BL:

1. a coupler for the tranny(is that all i need for the tranny?) and where can i buy it?
2. diffs, a friend gave me links to some diffs on ebay but that were labled as front t-maxx3.3 diffs. are the front and the rear diffs the same? and, can 3.3 diffs fit perfictly in all the 2.5 parts on my e-maxx?
3. i've got links to all the stuff i need on ebay to do the 3.3 conversion but after i added the total for shiping and everything it was about $110. but my question is, would it be cheaper or as cheap to get some CVD's/dogbones strong enough to handle the 8XL. If so, were could i find them?
4. will i need an alum spur gear?

p.s. this is my first post here but not on rc forums.

Thanks