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Thread: 1st gear ratio

  1. #1
    Registered Member
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    Mar 2017

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    1st gear ratio

    56.. 210..2dr..350 low hp..stock rearend..swapping stock 3 speed for a 4 speed what 1st. gear ratio should i look for and how do they effect proformance...muncie-t10-saginaw ? looking for light to light proformance

  2. #2
    Registered Member NickP's Avatar
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    Mar 2012

    Member #:1653
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    Transmission 1st
    M20 (63-65) 2.56
    M20 (66>) 2.52
    M21/M22 2.20

  3. #3
    Registered Member
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    May 2012

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    Super T10 are 2.43 -3.45, go to www.kajunjon.com and see his FAQ. we have only given you the tip of iceberg.

  4. #4
    Banned
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    Nov 2015

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    Whatever you do avoid using the M21/22 2.20 close ratio first gear transmission on anything less than a 4.11 rear, or it is a clutch slipping dog off the line for normal driving. I had my M21 swapped to the wide ratio 2.56 first running a 4.47 rear gear for a better take off. The only big RPM drop is from 3rd to 4th with the wide ratio, but by then the fun part is over anyway..

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