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I have a 69 NASCAR type Cobra and it has 3:91 gears in the rear end with a 4 speed. With 25" tires on the back I tack just over 3100 at 60 MPH.
If you can, get one of the little ISKY Ratio Computers. They are just a round cardboard disk with smaller wheels on both sides that will let you set any combination of stuff and read the other. And they are amazingly accurate. I think when I was a kid everyone had them. Once you get your readings in 4th if that is your straight through 1 to 1 gear, then it is easy to use one and determine the RPM, Speed, and gear ratio in 5th.
Ron
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