Seems like the Castle MMP/2400 combo is faster in reverse. Wiring is hooked up as instructed blk/blk, red/red, and white/white. I don't think the white needs to be connected? Reverse the transmitter and see? Using 3s lipo, reg tires, 20/54 (which needs to be more like 15t because the temps were rising) gearing the slash is just slightly faster than our stock slash on 2s lipos.