A vehicle includes wheels, an engine, a start switch, a differential, and a differential lock controller. Each wheel is rotatable at a respective wheel speed. The start switch is configured to selectively initiate of operation of the engine. The differential is associated with the wheels and includes a differential lock. The differential lock is selectively movable between a locked position and an unlocked position. The wheels are rotatable together when the differential lock is in the locked position. The differential lock controller is configured to facilitate restriction of the wheel speed of at least one of the wheels when the differential lock is in the locked position. The differential lock controller is further configured to facilitate selective disablement of the wheel speed restriction when the start switch is actuated with the engine operating. Methods are also provided.