So I’m hoping to run my car for the first time next weekend and I need to figure out the right gear ratios. I found a post on a forum for the car and track I need, but the final drive ratio is wrong. Here’s what they suggest for a 9:31 final drive:

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1st: 21:30

2nd: 22:28

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3rd: 24:27

4th: 25:26

The final drive in my car is 13:36 and changing it involves taking apart the differential and buying a very expensive new ring and pinion. Does anybody know how to calculate what I need to put in my gearbox? I barely passed high school algebra.

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Pic of my car for your time.