I've moved the motor shaft through the motor so that 2/3 of the shaft looks out at the front and 1/3 of the shaft looks out at the rear. I have replaced the two braces by the long rod from the front to the rear.
It's handling very nice, i don't feel a great difference without the center diff.
I'd like some more voltage for speed runs but i couldn't find 5s or 6s batteries with a small capacity like 1800mah or something like that.