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IDENTIFY THIS SECTOR SHAFT !

Discussion in 'The Garage' started by ColAdo82K5, Sep 19, 2004.

  1. ColAdo82K5

    ColAdo82K5 1/2 ton status

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    Hey,
    So I tried to install a 2wd sector shaft into my 4wd box, and after over an hour of trying, i realized i had the wrong one. So what is this sector shaft from ???? "Dr. Todd" and I figure it must be from a different ratio box.
    http://community.webshots.com/photo/61561424/189256643ktyJRS
    Any thoughts ?

    Blake
     
  2. az-k5

    az-k5 1/2 ton status

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    Maybe a manual 2wd box?
     
  3. ColAdo82K5

    ColAdo82K5 1/2 ton status

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    Looked into that, and the top plate take goes with the shaft is completely different on a manual box.
    Oh well....
    Blake
     
  4. JDNobodi

    JDNobodi 1/2 ton status Premium Member

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    I'm not sure, but I've read some where that later (81-up) model boxes are variable ratio. Your old 4wd shaft is from a variable ratio box. Your new shaft is a non variable ratio box.
     
  5. 84_Chevy_K10

    84_Chevy_K10 Banned

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    GM didn't use variable rate power assist until WELL into the '90s on pickups.
     
  6. JDNobodi

    JDNobodi 1/2 ton status Premium Member

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    [ QUOTE ]
    GM didn't use variable rate power assist until WELL into the '90s on pickups.

    [/ QUOTE ]
    I don't know about you, But I looked at the picture and that old 4wd sector shaft IS from a variable ratio box. That means variable ratio boxes were avialable earlier than what you said should be.

    When I said I not sure, I meant I wasn't sure what year when GM started putting variable ratio boxes on their trucks. But I now do know now at least 1982 because that is what year ColAdo82K5's blazer is.
     
  7. 84_Chevy_K10

    84_Chevy_K10 Banned

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    How does changing fluid flow vary the ratio of a gearbox?
     
  8. JDNobodi

    JDNobodi 1/2 ton status Premium Member

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    Variable ratio streering boxes isn't variable by the fluid pressure but by the gearing in the box. A tale-tell sign of a variable ratio box is the longer middle tooth on the sector shaft.

    Variable ratio boxes provide a slower ratio for the center one-half turn for precise streering and quicker ratio as the streering wheel is turned beyond that.
     
  9. ColAdo82K5

    ColAdo82K5 1/2 ton status

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    Thanks for the info.
    Blake
     

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