Tranny fluid prob

Car is '90 GS, 2.0 5-spd. Somebody told me that if i pull off the sensor on top or the tranny, it will be way easier to fill my gear oil. How do I know when to stop? I don't want to blow a seal, will I if I overfill? Or can I just fill it all the way up?

http://files.automotiveforums.com/gallery/watermark.php?file=/500/879661gfillplug.JPG

Try going back and see if you can find the fill plug.

Also you can't find that.. according to the FSM you need 2.4qt

Thanks, I haven't checked it since I bought it a couple of months ago, I was just gonna put more into it, but maybe i'll just drain it all the way and go from there. I should just fill it to the fill hole level, right?

Yep.. it should be level with the bottom of the fill hole.