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SM465 2nd and 3rd gear ratios- what are they?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ponderingjunkman, Jan 20, 2002.

  1. ponderingjunkman

    ponderingjunkman Registered Member

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    Anyone know what 2nd and 3rd gear ratios are for the 465? I know that 1st is 6.55 or 6.58, also 4th is 1 to 1. I want to use the online calculator to figure out my speeds till I can afford Autometer's fancy speedo that compensates for tires/gears electronically. Anyone run this speedo? There was a mag write-up a couple years ago on it. Since I am combining a pile of parts that probably won't like each other, I figure this speedo will be the slick way out of the inaccurate speedo dilemma. So if I knew those ratios, I can get by cheap for now!! Thanks!!

    No Replacement for Displacement
     
  2. TXsizeK5

    TXsizeK5 1/2 ton status

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    Low- 6.54
    1- 3.57
    2-1.57
    3-1.00

    Reverse is something around 4 I THINK
    Hope this helps man.

    87 Custom Deluxe
    305/Sm465/ NP208
    4.56 , 35" BFG Muds, Series 40 delta flow 3" tips
    Coming Soon: Suspension Work, Eaton Posi, More Exhuast work.
     
  3. JIMs70K25

    JIMs70K25 1/2 ton status

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  4. 55Willy

    55Willy 3/4 ton status

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    <a target="_blank" href=http://www.4lo.com>Heres the chart</a> to all the tranny's and thier rations, and even a calc. to figure your speeds.



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  5. m j

    m j 1/2 ton status

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    i am going with Jim's numbers.
    curious though where the 1.57 number is from as I have seen it several times now.

    formerly 77chev
    still a jerk though
     
  6. 55Willy

    55Willy 3/4 ton status

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    4lo.com list them as
    1st- 6.55
    2nd-3.58
    3rd-1.57
    4th-1.00



    <hr></blockquote> Do not write below this line

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  7. TXsizeK5

    TXsizeK5 1/2 ton status

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    I got my numbers from a summit catalog.

    87 Custom Deluxe
    305/Sm465/ NP208
    4.56 , 35" BFG Muds, Series 40 delta flow 3" tips
    Coming Soon: Suspension Work, Eaton Posi, More Exhuast work.
     
  8. ponderingjunkman

    ponderingjunkman Registered Member

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    Thanks very much!!

    No Replacement for Displacement
     
  9. m j

    m j 1/2 ton status

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    i am going to have to admit i was wrong.
    my own notes claim 1.58:1 3rd
    so to finalize the issue i opened my spare 465 apart and got the tooth counts.
    i will start mathing it but here is raw data
    input gear is 17 teeth it drives a 40 tooth counter gear
    3rd- 36 tooth counter drives 26 tooth speed
    2nd- 23 tooth counter drives 35 tooth speed
    1st- 14 tooth counter drives 39 tooth speed
    i did it assembled with top cover off and through pto cover

    formerly 77chev
    still a jerk though
     
  10. m j

    m j 1/2 ton status

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    maybe not after all
    1st = 6.554
    2nd = 3.5805
    3rd = 1.699
    4th = 1


    formerly 77chev
    still a jerk though<P ID="edit"><FONT class="small">Edited by m j on 01/23/02 07:42 PM.</FONT></P>
     

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