electric power to the solenoid is provided via slip rings not shown upon actuation the coil 193 may drive the plunger 191 and rotate it a short angle so that cage 194 b causes engagement of inner race 192 b with outer race 196 b of electromechanical actuator 197 through roller elements 175 as previously described for fig8 and 12 this causes the sun gear extension 151 and sun gear 145 to cease rotating engaging the two speed transmission and placing the transmission into underdrive another embodiment uses a single electromechanical actuator in a two speed auxiliary transmission fig1 depicts a two speed transmission 200 with a single electromechanical actuator 210 and a planetary transmission 220 within housing 206 in this embodiment there is a flange gear 201 and a drive shaft 202 with drive shaft extension 203 sun gear 204 and sun gear extension 205 the electromechanical actuator 210 may include an inner race 216 in splined connection with sun gear 204 and sun gear extension 205 and may also include cage 218 and outer race 219 not visible are the internal components included roller elements springs and the like as previously described this embodiment features a ballscrew 223 driving cage 218 and rotating the.