First of all... I would leave the motor in it's pack and try to sell it back on... it's far too fast for 2wd. Let alone the extra maintenance it will need compared to a brushless (or even a mild brushed).
If you are committed to the motor, you'll need a small pinion on there, the manual says 20T is the smallest that will fit on there, I would go with that, or even smaller.
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