Knowing what issues your car has may seem like an impossible task, mostly to the untrained eyes and ears of the average driver. It may be beneficial to think of your car’s inner workings as similar to that of the human body. For example, if you have chest pain that could signal any number of health issues, but if the chest pain happens in addition to difficulty breathing, then it is much more likely that asthma (or maybe something very similar) is the cause. Automotive issues are diagnosed in a similar manner. Problems that involve mechanical systems typically show distinct sensations and sounds that act as signs that a certain process isn’t working the way it was intended to. As soon as you notice that something seems that something has gone south with your vehicle’s functionality, it is time to assess the issue and look for a way to fix it.
http://www.automobileglobe.com/10-most-common-transmission-issues/