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i have a 66 fairlane with a 302, a c5 , and a 2.80 rear end, the motor is built with a cam, exhaust, carb, intake, i also have a shift kit and a high stall converter. i want a 3.23 rear end but i can only find 3.55 for ford 8 inch rear axles. what rpms would i be at on the freeway at 70 with 3.23s or 3.55s?
 

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There was a 3.40 that was commonly used in Mustang IIs from '74-78. That might still be found in wrecking yards and be an "in between'' ratio for you.
Randy
 

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i have a 66 fairlane with a 302, a c5 , and a 2.80 rear end, the motor is built with a cam, exhaust, carb, intake, i also have a shift kit and a high stall converter. i want a 3.23 rear end but i can only find 3.55 for ford 8 inch rear axles. what rpms would i be at on the freeway at 70 with 3.23s or 3.55s?
Pretty sure you can get 3.25 ratio for the 8".

https://www.summitracing.com/int/search/part-type/ring-and-pinion-gears/axle-model/ford-8-in?N=4294872241

3.25 is a great all round street and hiway gear.
 
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