Transmission: It is the place where the different "gears" of the cars are located.
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There is a shaft that comes from the engine and then there is another one that comes out of it and goes to the wheels. Through a set of gears, it moves at different speeds even when the engine moves at just one constant speed, so it takes advantage of the engine's power. They may be manual or automatic.
I have a 2002 Ford winstar and to say the least I got 100 miles out of it before the front pump seal blew out. Fixed that and about 6 other issues. Now I need to replace the entire transmission. I don't want to pay $1500 ( more then I paid for the van) but I do have a Ford Taurus year 2002 with a great transmission. Can they be interchangeable?