I have never messed with a Slash 4x4, but, I recently picked up a roller I have a couple questions about. With a 3900KV 3650 brushless motor, what would be a good starting point pinion wise? Anyone pull the driveshaft and run it 2WD, or would it be better not to? I have ran a mid motor 2WD before that was originally 4WD, from another company, and that didn't go too well. For ESC and motor, Traxxas VXL or Radient Reaktor? I have never used either, but, I have a chance to pick up a VXL-3S and TRX 3500KV motor, and a Radient Reaktor with 3000KV motor for the same price for either.