Traxxas TRX-4M Brushless System - ESC & Motor - 6250TRX 4M Brushless Power System The TRX 4M Brushless Power System gives you up to 50% more speed, more crawling torque, and greater precision than brushed power systems. Rip wheelies in your monster truck or navigate a technical crawling course in your custom High Trail rig. The new TRX 4M Brushless Power System gives you the best of both worlds! Rip wheelies in your monster truck or navigate a technical crawling course in your custom High Trail rig.