Automatic transmissions are very complex and not easy for just anyone to diagnose whats wrong with it or where its leaking. Best way to find the leaks are to jack the car up and put on jack stands for safety. Then use a degreaser or cleaner to remove all the dirt and grime from the transmission. Lower the vehicle and drive it at very slow speeds to keep from blowing the leaking fluid far from its source. Then put the car back on jack stands and look for the leak.
Common places for it to leak from is the fluid pan, filler pipe, cooler lines, or speedometer sensor.
If its coming from the pan, most likely its going to be the gasket and just needs changing (its a good idea to change the filter while your in there if the car is equiped with it). Other parts, depending on where they are leaking, either will have to be replaced or tightend.
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