You add it down the dipstick tube.
The transmission in a 2000 Astro is a 4L60E.
Assuming that they are both 4wd or both 2wd and the same model transmission (4L60E), they are interchangeable.
Remove the plug from the bottom of your 2000 Chevy transmission. Allow the transmission to completely drained out. Return the transmission plug to its original position. Fill the transmission with new fluid.
The correct automatic transmission fluid for that vehicle is written on the transmission dipstick.
The transmission fluid capacity, in your 2000 Chevrolet Cavalier, is 12 quarts. It is recommended to change the transmission fluid every 30,000 miles.
heater sensor circuit Chevy astro 2000
They did not use a 700R4 in 2000 model. It would be a 4L60E.
They recommend 30,000 miles.
DEXRON 3
If it's not leaking it doesn't need additional fluid.
Check the transmission dipstick, it is written on the stick what fluid to use.
The transmission is a 4L60E.