I'm just wondering about the gear ratio in the transmission because I know I can lower with the spur and pinion but wouldn't that be counter active to using the high gear in the tranny, I was just wondering how low you can gear on the spur and pinion, how tall a spur and how small a pinion can you get?

I 've been thinking about it, and I think I might keep both gears after all just in case in some crawling situations where you need more wheel speed and less torque

Torque won't be a problem, because I plan on using twin 65 T Lathe motors run off of the stock EVX but rewired for 7.2 Volts, instead of the 14.4v