Do I need to completely drop the pan to do it or is there a plug that I just can't seem to find.
Thanks.
Well, if there's not a plug in the bottom of the pan, then yes you need to drop the pan.
1983 Camaro Z28
There is a drain bolt on the bottom of the trans on the driver's side. I used an 8mm allen key to get it off.
The fill plug is on the top of the trans right next to the red vent cap. This plug uses the same allen key as the drain plug. Make sure you take the fill plug out first. It's better to have a frozen fill plug on a tranmission full of fluid than a frozen fill plug on an empty transmission.
After some searching around here and elsewhere, it seems that 2 quarts or so is all the fluid it needs.
Good Luck