Tank steer system for vehicle

A drivetrain assembly for a vehicle having a propulsion system configured to drive first and second half shafts, the drivetrain assembly comprising:

• a gearbox assembly configured to couple to the propulsion system;
• a planetary gear set selectively coupled to an output of the gearbox assembly;
• and
• a differential having a differential case, the differential configured to operably couple to the first and second half shafts;
• wherein the drivetrain assembly is selectively operable in a tank steer mode that rotates one or more wheels on a first side of the vehicle in a first direction, and rotates one or more wheels on an opposite second side of the vehicle in a second direction opposite the first direction to thereby rotate the vehicle, and
• wherein the drivetrain assembly operates in the tank steer mode by selectively grounding the differential case and connecting the output of the gearbox assembly to the first half shaft via the planetary gear set, such that the propulsion system rotates the first half shaft in the first direction and, via the differential, rotates the second half shaft in the opposite second direction.