Next day E-Revo, is it geared right?

I love it when Tower ships from Arizona. I always get it next day and with the $35 coupon and $30 credit I had, I couldn't pass this up. Anyways I gutted my LST2 and put the MM/Neu 1Y/F in this badboy. All I have is a 18T pinion at the moment. Will this do? Or should I gear lower?

I tried using the speed calculator but I don't think I'm doing it right. My TrueRC 6400 lipos fit just right. I should be able to run it tomorrow a little. Also anyone know of a site that has MMM in stock?