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post #1 of 4 (permalink) Old 05-14-2019, 09:41 PM Thread Starter
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what rear end size for a c5

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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post #2 of 4 (permalink) Old 05-15-2019, 01:31 AM
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Re: what rear end size for a c5

Engine RPM Calculator

Some good online calculators , need to key in tyre height.

3.5 will put you likely just around 3K depending on tyres
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post #3 of 4 (permalink) Old 05-15-2019, 12:07 PM
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Re: what rear end size for a c5

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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post #4 of 4 (permalink) Old 05-15-2019, 07:53 PM
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Re: what rear end size for a c5

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Originally Posted by kameronn1903 View Post
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/sea...n?N=4294872241

3.25 is a great all round street and hiway gear.
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