gear for a 1/4 mile track






















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  1. #1
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    Oct 2009
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    iowa
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    Default gear for a 1/4 mile track

    hey guys im going to be running a smaller track then what im on now i was just wondering what gear would be good to run on a 1/4 mile track... im runing a 9in i have a 390 in there now any help would be awesome

  2. #2
    Join Date
    Aug 2010
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    Default

    if i was runnin a 1/4 mile i would run at least 600 somethin cause your gonna need the acceleration, pretty high gear

  3. #3
    Join Date
    May 2007
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    Illinois
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    Default

    On a 1/4 mile, I would suggest between 6.50 - 7.00 final gear ratio. With a 3.90, what gear is your trans in when you race?

  4. #4
    Join Date
    Feb 2009
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    429

    Default GM 8.5 gear help

    i run a 1/4 to 3/8 mile track

    I have a powerglide with 1:82 planetary that I run in low

    My engine is a good bottom end 327 bored .030 (331 ci.)

    right now I have a 3:73 gear and need more rpms, I dont want to buy too much gear but not enough either.

    Any advice is greatly appreciated

  5. #5
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    Oct 2009
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    iowa
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    Default

    i run a th 350 in 2nd

  6. #6
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    May 2007
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    Illinois
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    Default

    TH350 in 2nd is a 1.52 ratio X the 3.90 rear gear you have now is a 5.93 final.
    A 4.11 will give you 6.25 final.
    A 4.56 will give you 6.93 final.
    All depends on how many RPMs you want to turn.

  7. #7

    Default

    Quote Originally Posted by superstock_53 View Post
    hey guys im going to be running a smaller track then what im on now i was just wondering what gear would be good to run on a 1/4 mile track... im runing a 9in i have a 390 in there now any help would be awesome
    What is a 1/4 mile track? We run a 650 at 3 different tracks in the area and only turn about 300 rpm difference. One is high banked and claims to be a 1/4, one is medium banked and claims to be 3/8 (but I swear it is smaller than the first one), and the other is a flat track that is smaller than both the previous.

    Your best bet it to ask around to some of the other competitors. But I guarantee you will still get a wide range of answers.

  8. #8
    Join Date
    Jun 2007
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    berea,ky
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    829

    Default

    Quote Originally Posted by racinjason29 View Post
    i run a 1/4 to 3/8 mile track

    I have a powerglide with 1:82 planetary that I run in low

    My engine is a good bottom end 327 bored .030 (331 ci.)

    right now I have a 3:73 gear and need more rpms, I dont want to buy too much gear but not enough either.

    Any advice is greatly appreciated
    i ran a 1.82 with 4.11 gears there jason. turned 7000 rpm most nites...a l;il less when it was really slick.
    Bartley Grant
    #1 red,white and blue sportsman and mod-#24 lightning/smokehouse grill mod
    www.bartleygrant.com

  9. #9
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    Oct 2009
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    iowa
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    Default

    so u think the 3.90 would work for a bull ring 1/4 track

  10. #10
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    May 2007
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    Illinois
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    Quote Originally Posted by superstock_53 View Post
    so u think the 3.90 would work for a bull ring 1/4 track
    Nope, on a real small track, you will want the 4.56 IMO, it will launch you out of the corners. The 3.90 would work best on a bigger track with long straights. What size & type of tires are you using?

  11. #11
    Join Date
    Jul 2007
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    2,466

    Default

    Quote Originally Posted by Dirtman29 View Post
    Nope, on a real small track, you will want the 4.56 IMO, it will launch you out of the corners. The 3.90 would work best on a bigger track with long straights. What size & type of tires are you using?
    It depends on the quality of your motor and parts.

    Ive got 14 to 1 or more compression motors and with a 4412 carb I dont run deeper than a 600 on the tiniest quarter mile track Ive ever seen. That gets be 6600 or so rpm..

    I run 583 on another small track that a lot of guys run 633 etc. I turn 6600 there. I must have more compression or lighter motor parts than they do.

    I would run your 593 if you have it before I would buy anything different.
    IMCA Modified #66

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