I'am to build my e-revo with stock revo tranny, and use the 2 speed with the FOC.
My motor will be a feigao 12L runing on 4s li-po with the MM controller.

I do the Jato ppin mod on the tranny and use RD racing aluminium diff cup.

Gear 18/38 with wide ratio and proline badland MT tires.

The only thing that i don't trust on my setup is the fact that i'll keep the 2 speed. Don't know if the pin in the second speed gear will hold the brushless power when the tranny shift in secong gear. I'll run with a loose sliper, but as soon as the 2 speed will break, i'll:

-Put the Robinson racing hardened steel tranny gear OR
-Lock the tranny in second gear and order a feigao 9XL motor.

Both option cost about the same $$$