I have a mayhem, the pinion gear is 13 tooth and the diff gear is 43. Does anyone know if you can change the pinion to an 11 tooth and the diff gear to a 46 tooth. stick

yes you can go to www.horizonhobby.com and search for mayhem parts. they have differents bells and gears that will work for you.

if you havn't already changed the clutch bell then it should ba a 15 tooth, thats what a stock mayhem comes with. to your original question yes you can do that, but unless you want to break something with all the torque and also have no top end then i wouldn't recomend it. try a 13t or 12t clutch bell with you stock spur gear first.

I have a 13 clutch bell right now on a xtm 24.7, still doesnt have the balls on the low end. I race on a track that is very curvy then a jump. trying to clear jumps and triples.