When changing the transmission fluid of any car, it is important to know how much fluid to put in. A 2001 Pontiac Sunfire takes 2.5-3 quarts of transmission fluid.
It's an automatic, there is no clutch.
Check your Automatic Transmission fluid level
yes the engine will bolt right up.
Total capacity is 20 gallons.
You can't it is a sealed transmission. If you have no leaks then all if fine.
4T65-E 4-speed automatic transmission
Yes you can my neighbor has one same year automatic I don't know what transmission it is though sorry. I know it had a 350 in it