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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.
 

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Going from a 245-60 tire that runs 782 revs/mile to a 255-70 tire that runs 720 revs/mile would lower the rpm to about 2762.
 
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