I used the MIP slipper plates and top shaft and drilled some holes in my Spur Gear and used the Traxxas slipper plugs trimmed down a bit with a blade and it works great. I never liked the idea of the slipper plates running on just the plastic gear. The adjustments to the slipper nut are more linear instead of it slipping or not slipping. It would be great if someone like Robinson made alum. spur gears for it. I have a Castle Mamba ESC with a Eflight Park 4000kv motor on 3cell 1320mah 10c Thunder Power Lipos. I ended up putting a 1/10 scale buggy wing on it to keep it on the ground LOL.