build a gmaxx and i need help

[Maxxrickard]

is it any difference between 1:8 center diffs?can i use whichever?
i have HB diffs and i think i will go for a Hot Bodies Center Diff Hardened 50T Lightning:http://www3.towerhobbies.com/cgi-bin...&I=LXLGX1&P=SM

how about the gearing?any suggestions? 2200kv motor and 5s.

it looks that mike will make a batch of these, but if he dont i will build one by my self with a plastic center mount and CF...