[camtunkpa]

Originally Posted by jfelser

*bump*

Does anyone have thoughts on using a servo to drive this, without modifying the center spool to include a spring?

I pitty the little servo about to die. All joking aside, I think you might run into problems if there is no spring in the system. Remember for a short period of time every time you shift, there will be binding while you're waiting for the balls to line up with the slots in the gear. These transmissions are more friendly than others towards their shifting actuator, but I would seriously suggest having some spring in there. The plunger shaft doesn't have to have springs on it as long as the device actuating the plunger has some sort of shock absortion either in the unit or the connecting linkages.