http://www.tciauto.com/tech_info/calculators.htm#8

If you would look at the calculator page it shows the formula at the bottom of each one.. Therefore you will gain that much more knowledge of the formulas. Don't know if you even looked or not.
Just trying to lead you to the information you asked for.
Tire Height = (Rearend Ratio * MPH * 336.136 * Trans Ratio * Conv Slip%) / RPM
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Jason White
Thanks Hartline Performance, Don Cruz, DLS Engine, HRPartsNStuff, & Twisted 6 Racing convertors
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