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Slider,
I am uncertain if you are looking for gear ratios, or attempting to decode those 4 digit numbers. We can shed some light on the gearing itself.
If you indeed have a factory stock 915 gearbox in your SC, 4th gear ratio is 26/26 yielding a final drive ratio of 1.000 to 1. Your 5th gear ratio is 28/23, which yields a final drive of 0.821.
Hope this helps.
Ed LoPresti
RacePro Engineering
New York
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