A transfer case (14) of a motor vehicle drivetrain includes a planetary gear set (80) including a ring gear (82) to receive input torque, and a pinion assembly (84) having pinion gears (100) in mesh with the ring gear and a carrier (102) to carry the pinion gears and transmit output torque. A sun gear (86) is in mesh with the pinion gears, is selectively connectable to the carrier and rotatable therewith in a two-wheel drive mode and in a four-wheel-drive high range mode, and is selectively fixable against rotational motion in a four-wheel drive low range mode.