In modern cars like BMW X3, the gearboxes are used for increasing torque while reducing the speed of a prime mover output shaft. On the other hand, the output shaft of a gearbox is rotating at a slower rate than the input shaft and reduces the speed produced for increasing torque. If the gearbox is failed in your BMW, then it will cause severe problems while driving the car. Go through the following slide to know about the common reasons behind the gearbox failure issues in your BMW X3.