How does the 2 speed Opti Drive work for shifting?

[BrianG]

Yup, the little square upright "pegs" are the sensor crenellations. The sensor is a U-shaped device that shines a light from one side of the U to the other. The crenellations breaks the beam and tells the optidrive that there is movement and can even tell how fast (but not sure if the optidrive reads the speed).

I sincerely hope that if the emaxx uses a revo-like tranny design (which they would HAVE to if they want an autoshifting two speed with reverse), that they make the reverse gears far more durable. The setup in the Revo were horribly weak. Coupled with poor strength, any dust or debris that gets on the sensor will fool the optidrive into thinking that the truck is stopped when it isn't. The inside of the tranny is sealed, but all the trannys I've taken apart has some "gear dust" in there over time.