Xray Xt8

i am in the process of selling my revo stuff and just put my electrics in this truggy i got on ebay from mailman

xray xt8 with rc-monster motor mount
mm, 4s, 9xl
16/48

temps were 85-90*f in a 50*f underground garage

Q?...can i go to a 18 tooth pinion??(what i have)

i plan on using this for double duty, brushless and nitro so i will be making a new plate to put the electrics on to ease swapping back and forth

i will post a few pics soon, but they arent the final set-up, i just put it together and had to test

set up help for diffs and suggestions are welcome

heres a quick vid...........very low traction on dusty cement..maybe 35mph??

http://www.youtube.com/watch?v=nCAuVhs-w2o