Not a bad little pick up if the price was right.
First off your transmission is not going to last you very long based after reading your posts.
Second... most important.
DON'T BE IDIOTIC ON PUBLIC ROADWAYS!
You want to go mash the gas... go to Heartland Park.
You want to go fast on some curvy roads... find some place that does AutoX.
Grand Prixs are not designed from factory to be taking at high rates of speed through curves.
Read around and use a little more common sense. You will both save yourself money, and possibly hurting yourself/family/or others.