Need help setting up a Genesis

[93firebird]

Some may remember that I was trying to convert a Cen Genesis to a brushless truck. I have the driveline conversion done. I have pulled the tranny and have opted to run a locked center diff with a 66t spur gear. I am running a MMM v3 with 2200kv combo, of which I've fried two of!!! So what I need to know is what Battery setup should I run a 4s, 5s or 6s lipo? I plan to run an 11t pinion on the motor and I want to keep the stock wheel size which is 7.5. I was looking at a pair of thunder power 5000 mah 40c 2s lipos and was wondering if this would be enough to move the truck without any problems. Also should I adjust the motor timing to one. I am not concerned with insane speed, 40mph will be plenty for a truck this size. Some one please Help I don't want to cook another ESC they don't taste very good.