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speedo calibration for gear swap

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 88blueK5, May 14, 2005.

  1. 88blueK5

    88blueK5 Newbie

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    Hernando, MS
    i just swapped in 4:56 gears in my 1988 k5 w 700R4 & 33" tires, anyone know how i go about getting my speedo back to normal or close to normal??
     
  2. trailblazer86

    trailblazer86 1/2 ton status

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    Send me your e-mail I have the formulae that you are looking for.
     
  3. trailblazer86

    trailblazer86 1/2 ton status

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    Speedo Gear Calculator

    Try this link. It is a great speedo calculator.
    Chances are that your drive gear has 15 teeth.
    Now how to get the dealer to work on this is another Question. You may need to purchase a few gears to get the speed right on.

    A GPS is great for checking your speedo.
     
  4. jacksprat1599

    jacksprat1599 Registered Member

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    are thes gears difficult to change?Is it a DYI mod.
     
  5. trailblazer86

    trailblazer86 1/2 ton status

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    This is a very easy repair/mod.
    The only thing that may give you any trouble is the unit that holds the gear.
    (I can't remember what it is called. Brain fart I guess).
    Sometimes you will have to buy a different holder. This is also very easy and straight forward to replace. The parts person should know what you are talking about.
    Just figure out what gear you need. This will let you know what holder you need. The installation is straight forward.

    Be carefull and you won't even get any fluid on your fingers.
     
  6. rick88blaze

    rick88blaze 1/2 ton status

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    Check out bowtie overdrive They've got the calculator and the gears.

    Rick

    P.S. My '88 had 3.42's in it originally and I've got the same setup as you now, and my speedo is about 15 mph faster than my actual speed right now.
     

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