4 speed saginaw-what gear should i use - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-02-2013, 06:50 PM
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4 speed saginaw-what gear should i use

i have two saginaw 4 speed transmission one 2.54 first gear and the other has 3.50 first gear... building a 1930 model a highboy on 32 rails, 350 sbc, 9" ford rear 3.50 posi, 31" tire diameter.. not alot of horsepower and the car is pretty light.. what gears would work best with this setup ? (will be driving on the highway to car shows and a little bit of city driving

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Old 04-03-2013, 08:07 AM
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OEM's used to base their calculations for "Starting Line Ratio" or "Total Mechanical Advantage" on the formula Rear Axle x 1st Gear = 9. So, divide 9 by 3.50 and our theoretical 1st gear would be 2.57.
Use your 2.54 1st gear Sag; its has a better ratio spread and more strength than the 3.50 1st gear one

Last edited by AutoGear; 04-03-2013 at 08:13 AM.
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Old 04-03-2013, 08:49 AM
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just what i needed.. explained well,, thanks
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Old 04-03-2013, 09:06 AM
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No problem!

Post pics of your highboy sometime
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Old 04-03-2013, 02:09 PM
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pic of hiboy

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Originally Posted by AutoGear View Post
No problem!

Post pics of your highboy sometime
i have one pic in my photo album.. will get more on soon
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