Compatible
2 Answers
I'm not sure what all is compatible but one thing you want to be sure of is that the alternator is the same amperage if you're going to swap it.
2006 grand prix didn't come with a 3.1l the only engine options were 3.8l (3800 series 3) the 3.8l super charged or the 5.3l ls4 v8 absolutely no parts are interchangeable at all