I got my brushed merv back in April, and have a few questions about it. I want to get the proline trencher tires with the traxxas dish rims, and I want to know how to gear it properly. Also how am I supposed to know when my diff is perfectly shimmed? I have the associated shims. I might also upgrade to brushless and want to know what motor is cheapest and best, I will get the sidewinder 1/10 as the esc. Thanks!