Probably. That's why it's called a drain plug.
The transmission should be filled to the bottom of the top plug (with the car level). You could remove that one to get a sample, but really, what's the point? You can't tell much by looking at it. It doesn't get dirty. Normally you judge when it's time to replace the fluid by looking at the odometer or by the feel of the shifter.
Last edited by Blacklane; 01-13-2013 at 09:43 AM.