2001 GA GT Amount of Tranny Fluid?

I have a 2001 Grand Am GT that I have pulled the tranny pan and replaced the filter. I took out about 2 gallons of fluid in doing so... and I have now put 2 gallons back in. How do I know when it's full?

Should I see fluid at the fill cap?

Or is the check plug on the side of the tranny the indicator?

Thank for any help,

2 gallons !?!

Just with a F & F change its 7 quarts.
Dry with converter it 13.5 or so.

To check it you hav to hav it on a lift level and thiers a check plug on the back side of the transmission. facing the rear of the car.

What brand Dextron-III ATF are you using Xero. I'm getting ready to do the 50K tranny service on the Alero (41K miles) in the near future. Normally I use regular Castrol in all of mine. Anyone using synthetic?

I'm using Castrol Syntec Dextron-III in my SE, its been doning great. Havent had any issues.

The GT just has Reg. Castrol Dextron III for now.
I really dont drive the GT everyday right now.