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Everything will bolt right in without a problem, but like Cliff said, there are some major wiring/electrical harness issues that you'll have to address. If you get a donor motor/trans, I'd highly advide getting the entire electrical harness and PCM to make things a little easier.
You can pillage either a coupe or sedan; it doesn't matter.
All V6 car got the 4T45-E trans, and all have the same gear ratios. The only slight diffence is that the Grand Am GT got a slightly better 3.29 final drive; other cars make do with a 3.05 final drive.
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