Hi I have a old 3906. And I was wanting to breath some new life into my old model. I installed a Tacon 3500KV 3660 and a 120amp ESC. I have been driving and testing it for a week now on 2s lipo. I have had no problems with heat, and it is a torque monster with 66 spur, and 17 pinion. Granted this is a very mild brushless set up compared to some of the 1/8 scale motors. But it makes me happy and, I am now happy to use my Maxx again. The brushed motors I was using was the Trinity Monster Maxx wild version, and this was good, befroe I knew what brushless was.