No one likes to hear the dreaded words, “Your transmission is blown.” Your cars transmission is responsible for most of its engine functions and capabilities. As soon as a car’s transmission requires repair, most car owners see dollar signs adding up. Catching a transmission problem before it becomes a transmission disaster could be the difference between a five hundred dollar fix and a five thousand dollar overhaul. Stay on top of your transmission by keeping an eye out for key signs of transmission trouble. 
One of the tell-tale signs of transmission problems is trouble on starting. A transmission in need of repair will have trouble turning over or may grind upon ignition. If your car stutters before turning over, it could be simple problem like moisture in the electrical wires or a much bigger problem like a transmission in need of repair. If your car seems to have trouble starting, it’s best to have a mechanic test the electrical system and check the transmission.
When a car is in motion, acceleration problems or stuttering are signs of a problem with the transmission. Vibrating, stuttering or trembling during acceleration or deceleration could indicate serious transmission trouble instead of the simpler problem of poor tuning of the engine. You might also notice that the engine fails to engage even though you apply pressure to the gas pedal. Any of these experiences during driving could lead to a more serious problem like complete engine failure.
Usually fluid leaking from beneath the car is oil, but occasionally a car may leak transmission fluid used to lubricate gears inside the engine. A transmission fluid leak can cause the engine to overheat and cause permanent damage to electrical systems. Small leaks can be repaired by mixing a stop leak solution into the fluid while major problems needs to be handled by a mechanic.
If all else fails, you can always refer to your check engine light to alert you to any problems in your engine. Most cars use electrical and computer systems to monitor the proper functioning of the transmission. If the check engine light comes on, assess the rest of the car’s performance to determine if the engine trouble is related to a transmission problem. When in doubt, take your car to a qualified mechanic to determine whether or not your transmission is in need of repair.