After I get new wheels and tires I was considering my next modification to be rear end gears. Have any of you replaced or bought an automatic GT with 3.55 gears? If so, what is your opinion of them? Was it worth the swap? I read online that some auto's can come with 3.55's from the factory but I don't know for sure if that is true. I have the stock 3.15's at the moment and was considering changing them. I do not want to kill my highway gas mileage so I was leaning towards 3.55's vs 3.73's or the 4.10's.