$.56 to 5.13 i,d say for an average bracket car. I ran a 391 with 26 in. tall slicks ant car ran consistent 12s Changed to 4.57s and ran out of motor in last 200 feet and had to pedal. no better time . channged to 30 in. slicks and put car in high 11s Sometimes gear changes work better with a specific tire size . If you use 2 much gear you can compensate with taller tires if you have enough convertor to stay in your power in the 60 ft.