A friend of mine wants less gear in his gto. He has a 373 gear and is running 245-60-15 tires, he sees 3000rpms at 60 and wants to ease up on the motor for hiway cruising. its got a muncie 4 speed. does anybody know what kinda rpms he would be turning if he went to a 245-70-15 tire or recomend a other tire size that would fit the car and lower his cruise rpms. its a sweet 70 judge converable clone with a pretty tuff running 455. thanks for any advice.