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That's a good idea to just run taller tire for driving around on the street. I could put a 275/60-15 on it for driving on the street and then use my 27" tires for the track.

I found this forumula online also.

Tire Diameter x RPM / (336 x mph) = Gear Ratio

IE: 27 x 5500 / (336 x 90) = 5.13

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Now throw in the percentage of converter slip like 8.5% and what do you get plus how about the torque multiplication of the torque converter on the starting line ratio? BTW, a 4:56 ratio on short tires like your talking about is real close to the same results using 4.89 with a 29 inch tall tire or a 5.13 ratio with a 30 inch tall tire BTW, are your track tires bias ply or radials? That makes a difference on which hieght tire and rear gear ratio to choose