Differential gear and drive train with such a differential gear

A differential gear with an input side that can be rotated about an axis of rotation, which has a rotary drive contour for the rotary drive engagement with a drive wheel and at least one pinion gear that can be rotated about a pinion axle, and an output side that can be rotated about the axis of rotation, which has a first axle wheel and a second axle wheel which are in rotary drive engagement with the at least one pinion gear, wherein the input side has a rotary drive section on which the rotary drive contour is provided, and a support section on which the at least one pinion gear is arranged, wherein the rotary drive section and the support section can optionally be brought into a rotary drive connection with one another by means of a shiftable pawl freewheel, wherein the pawl freewheel has an outer race, an inner race and in the radial direction between the inner and outer races pivotably arranged pawls, wherein an activating element which can be displaced in the axial direction is provided for shifting the pawl freewheel, and wherein the activating element is arranged on the input side, via a support element fixed to the input side, so that it is displaceable in the axial direction, the activating element having a tubular supporting section which can be or is slidably supported on a tubular support element section of the support element.