Transmission fluids are a very important part of a vehicle. They go a long way in determining the movement of a vehicle. Without the transmission the vehicle won't move and without the transmission fluid, the transmission cannot work. It is therefore, very important that the transmission fluid of a vehicle is never compromised. There are universal transmission fluids that work with a number of vehicles like the Dexron III brand, but it is more advisable to always know the specific transmission fluid that is suitable for your vehicle's transmission. The problem with not using the right transmission fluids is that, the transmission could get damaged beyond repair or the gears will start having abnormal shifts. So also, transmission fluids last longer than engine oils. Therefore, unlike engine oils, they aren't changed over long periods of time. To know when to change the transmission fluid of your vehicle and the right one to use,check your owner's manual.