I'm knew to Brushless and have a question to ask

[Snipin_Willy]

The 7700 CC motor was ment for lightweight speed cars. Not nearly enough of a motor to power an Emaxx. You should look into a motor that was designed for 1/8 scale, and something between 1600kv and 2200kv depending on what batteries you want to use.
Some people have used the MM controler in the Emaxx but it wasn't designed to push heavy RCs and it takes a big beating doing so. The Mamba Monster or Tekin RX8 are much better suited for monster trucks