info on Emaxx upgrades...please help

[Serum]

The wisest thing to do;

3.3 diffhousings
FLM diffcups with M3 holes/upgraded ringgear
FLM bulks
if you REALY want a tough as nails drivetrain, get the FLM 1/8th combo bulks with hotbodies diffs.
3.3 driveshafts (if you use these with the 1/8th diffs, you also need special output shafts on the 1/8th diffs)
RPM arms
integy 3.3 knuckles
FLM e-maxx chassis
FLM shocktowers
steel idlers