Because of the fast speed from the engine to the wheel, the cross country automotive used X type four-wheel drive system. It needs a reducer beside the wheels to decelerate speed for the second time and change direction of the torque from the driven shaft. 由于从汽车发动机传到汽车轮子上的转速较快,该越野车采用X型四轮驱动系统,所以必须设计一个轮边减速器进行第2次的减速以及改变驱动轴扭矩的方向。