My thing with the gears was "true street car". Don't know too many "true street cars" that run higher than a 4.50 gear. Somebody will say they do all the time... but I had to have a cut off. Of course, you can do it how you want... and I don't know of an accurate 1/8 mile chart to convert to 1/4 mile. The computer calculators have never worked out with my cars.