well i rember there was a way to ridge the 2speed from a old RS4 racer 2 (belt drive ones) onto the HPI rush evos.......i saw 2 or 3 people do it.......maybe if the shaft where the slipper mounts onto is long like the rush evo one the 2speed can fit......the only thing needed was a few shims and a dremel to leave a flat spot on the shaft for the 2snd gear hub.......


BUT do rember even if it works there is no slipper clutch involed meaning u will most likely tear it up if u go offroad the rush evos i saw where set up for onroad only