Is the large pan under the engine for the transmission or differential or are they combined?
Thinking that the large pan under the engine was the oil pan, I drained the oil. Now, I find that the oil pan is more off to the passenger side of the car. What did I drain and what fluid goes back in and in what quantity.
what color was the fluid? it was more than likely the transmission fluid, and you do NOT want to drive it without that. In most cars the transmission oil is red, but you will want to make sure you add the correct stuff back in- the grades of transmission oil are not universal between brands. Your owners manual will tell you how much transmission fluid it holds- put it in and then let the car run for a little bit and then check it again to make sure the level is right- it should be checked warm, not cold. If you don't know how to do this, have a professional do it because you don't want to do it wrong or overfill it.
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