[RC-Monster Mike]

To clarify my email a bit, i reported a needed ballpark gear ratio to achieve 40 mph. If you run in open areas and spend your time going fast, you won't have any troubles with this gearing. If you try rock crawling with 40mph gearing, your gonna find yourself in trouble. Ideally, you want your gearing to reflect your typical driving style/terrain etc. that you spend your time in. If you spend most of your time driving in tall grass at 15-20 mph, then I wouldn't suggest a 40 mph gearing. For general bashing, gearing for low-mid 30s is typically plenty of speed and allows decent runtime. If your running in the street and just want to dust your nitro buddies, then the 20/54 gearing would get the job done for you. If you want the best of both worlds, get an extra pinion or so - it takes about 20 seconds to switch to "high speed" gearing when you need it, but in 20 seconds, you can switch back to "torque, power and runtime" gearing for lower motor/controller temps, longer runtime and general good times(gearing such as suggested in this post, for example). :)