Tranny Fluid. How much? NEED TO KNOW FAST

So my dad and I were just doing some general work on my truck. We were checking the level of the transmision fluid and he accidentaly removed the bottom plug on it. Well that drained a lot of the fluid. What I am needing to know is how much I need to put back in. I don't know exactly how much drained but I am planning on draining the whole thing.

I have a 89 s154cyl motor with 5 speed tranny.The tranny fluid that was in their was the thinner red stuff(AT fluid is what my book said)

Please if someone can help.

you should have a fill on the pass side, about halfway up the tranny... you fill til it comes out....

"ditto"

Thanks for the help. I called a local GM dealership and asked a service guy there. He told me 6 quarts. I used 3.

you did use syncromesh right cause if you didn't you'll be doing it again cause it probley wont shift right for very long. just my experance and its not cheap at 9.00 dollars a quart

No I used Dexron 3. My owners manual and Chilton manual told to use Dexron 2. I went to a few different places(NAPA, Shucks, Autozone) and was told Dexron 2 isn't made anymore and to use 3.

Mine takes the auto tranny fluid.

And it seems to shift fine.
My tranny is a little on the loud side but it has been that way since I bought the truck. Not really sure why it is loud but you can hear it over the stereo once I hit 4th/5th gear