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Speedo adjustment?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by horsepit, Jan 18, 2002.

  1. horsepit

    horsepit Registered Member

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    Location:
    Ventura, CA
    Is there a bolt on adapter to correct my speedometer. I seems about 5 MPH slow now.

    1987 Blazer, 350, TH700R4, NP208, 3.42, Rancho 4", 33"
     
  2. Tatman

    Tatman Registered Member

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    I have the same problem, my speedo shows @42 when I'm doing 55. I've gotten use to it and just figure I'm doing @ 10mph faster than the speedo until I can figure out a way to get mine set. Then if I decide on a larger tire size I'll have to do it all over again.

    Brian
    <a target="_blank" href=http://www.saddletramps.com/BlazerK5.htm>www.saddletramps.com/BlazerK5.htm</a>
     
  3. jc71355

    jc71355 1/2 ton status

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    Location:
    Port Neches, Texas
    I have been told that the Chevy Dealers have the gears to correct for larger tires but i haven't looked into it.

    91K5 350 2.5in Suspension lift 33/12.5
     
  4. Thunder

    Thunder 3/4 ton status

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    Just change the spedo drive gear.You can get a different gear from the dealer or from a spedo shop. The gear you need to replace is in the x-fer case where the spedo cable attaches to it. It is a easy swap. Just take off the keeper and it comes right out.

    <a target="_blank" href=http://coloradok5.com/gallery/Thunders-Blaze> Blazer pics</a>

    <font color=blue>Nevada... Where the pavement ends and the west begins
     
  5. jc71355

    jc71355 1/2 ton status

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    Location:
    Port Neches, Texas
    How do you know what gear you need to go in there?

    91K5 350 2.5in Suspension lift 33/12.5
     

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