gyrogearloose I am just trying to help. I think I would think long and hard on this one before I spent that kind of money on that trans because at your weight and HP I think you will lose ET with the th400. You may want to go with a Bruno or the likes to get more gears in your trans. Most high HP cars that you see at your weight that run auto trans will run a glide or a bruno type trans. Its just a thought you may want to check into.