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Thread: best way to determine a rear end gear ratio

  1. #1
    Senior Member MASTER BUILDER
    Join Date
    Mar 2008
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    173

    best way to determine a rear end gear ratio

    what is the formula for determining a rear end ratio. my buddies vega has 26 inch tires,4 speed muncie, and a 355 sbc. he says the cam is a circle track cam and makes power from 3500-about 8000 rpms, say he wanteed to be coming through the traps at about 7800 rpms, what would be the aprox ratio to obtain the desired rpm do i have enough specs to complete the formula thanks chevy art

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
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    La.
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    2,890
    You can use this formula EX: if the engine has enough HP to run 120 mph in the qtr.
    The gear ratio would be a 5.00 gear. But i'm thinking 4.88's or 4.86 gear would work best. Ofcourse if the HP is higher you'll need to go down on the gear.

    Zip.

    http://www.wallaceracing.com/calcrgr.php

  3. #3
    Senior Member RACING JUNKIE
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    Sep 2007
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    orland pk il
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    2,429


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