Grand Am SE and Alero, both with V6 engine do share the same transmission, the Grand Am GT has a different final drive ratio. It's a direct swap, but you will need programming to make it work.
As for other cars, unless you want to do programming, which is not hard, but you need the tuner to change the gear ratio in the car's computer.
The wiki link fallout boy posted is good. It does leave out 2 important notes. 1 is kinda important, the other is majorly important
The minor. 99-00 has a different axle seal than 01-03. nothing else is different
The major. starting in 04, GM starting using a different transmission pump. It is unknown if this pump will work in an 03 and older car. Nobody knows if the it's just the tuning, or even if the correct wiring exists in an 03 & down car
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