Gear question to a new build E-Maxx

I´m building a new E-Maxx Brushless (MMM) with a lot of option parts.

At the moment I´m not sure if I choose the right parts for the gear.

I use the Traxxas transmission, motor 17T/68T and would like to use the HB Diffs C8178 with the pinion C9009.

Do I have to change the motor gear or will it these parts fit?

The Maxx should not be a high speed racer, more a basher. I will use 4S lipos and 6S aswell.

Thanks for your comments