Clutch actuation system for two-speed active transfer case

A transfer case includes a two-speed range unit (42), a friction clutch (46), an actuation mechanism (48), and a control system (50). The actuation mechanism (48) includes an electric motor (58), a geartrain (140) driven by the motor (58), a range actuator assembly (144) and a mode actuator assembly (146). The range actuator assembly (144) includes a driveshaft (142) driven by the geartrain (140), a cam (172) driven by the driveshaft (142), and a shift fork having a follower retained in a groove (173) formed in the cam (172) and a fork engaging a shift collar (84) associated with the range unit (42). The mode actuator assembly (146) has a cam member with ramp surfaces and a control gear with rollers engaging the ramp surfaces. The control gear is rotatively driven by the geartrain. The cam member is axially moveable for controlling engagement of the friction clutch. An anti-rotation mechanism limits rotation of the cam member in response to continued rotation of the control gear.