ok guys so I'm trying to figure out how to get this damn typhon mega upgraded. I know its 48p and whatnot. But under optional parts on the arrma page it shows can be paired with the 3s slipper assembly. But my thing is they look totally different. The mega has the spring on the outside and 3s doesn't. Is it just a switchout or do other mods need to happen. Besides the pinion. Im just a little confused. Is it a direct swap or no? Thanks guys.