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Old 09-03-2002, 09:14 PM
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Post Rear end Ratio

I would like to know if I plan on going with a 700r4 trans on a BIG BLOCK engine what type of gear ratio on the rear end should I use? I plan on driving it on the street. Some say 3.73 is a good set up is this true?

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Old 09-03-2002, 10:50 PM
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3.55 or 3.73 are all around good rears, nothing bigger unless your planning to race and can afford the gas.

HK
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Old 09-04-2002, 08:30 AM
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What rpm's do you want to drive at? Take your tire size and determine number of revolutions per mile, convert that to engine rpm using your 700R4 final drive ratio and you can determine the necessary axle ratio necessary to get the rpm's you want. 3.14516 X diameter of tire for distance traveled or you could just measure the distance by rolling the tire.
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Old 09-04-2002, 10:46 AM
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3.73 ratio with a 700 r4 puts your first gear at the ideal 11,40:1 and you will be turning 2200 rpm at 70 MPH in fourth with 28 inch tires (275/60x15) that is what i am putting in..
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Old 09-04-2002, 12:48 PM
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why 3.14516??
3.14159 maybe? pi?
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Old 09-04-2002, 07:08 PM
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Apple pi or cherry pi?????
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Old 09-05-2002, 10:36 AM
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Check out Randy's Ring & Pinion at <a href="http://www.ring-pinion.com/home.shtml" target="_blank">http://www.ring-pinion.com/home.shtml</a>
Then check out the calculators link. You can plug in your tire size and all the gear ratio's you want to see what rpm's you will be turning with each one. No math involved.
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Old 09-05-2002, 11:49 AM
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yee-hawww. how'd you know i needed to change my gears. these 350's just don't cut it with a 5000 pound truck!
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