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speedometer ?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Skippy, Feb 1, 2001.

  1. Skippy

    Skippy Registered Member

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    Can anyone tell me where to get a speedometer adapter. I installed bigger tires so now my speedometer is off. I know back in the 80's there was a company who made adapters for this.
    thanks
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    Hmm..ony place I have seen them s on the Chev transmissions/transfer cases in the wrecking yards. They usually leave them attached. A better question might be "how do I get the driven dear out of the transfer case" I assume that they come out just like on the transmission (unscrew speedo cable, and driven gear retainer) and then you just swap them to one with the right ratio. However, maybe now someone will explain how the transfer case driven gear is changed.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://yeagerd.home.mindspring.com/index2.html>http://yeagerd.home.mindspring.com/index2.html</A>
     
  3. Rebel88

    Rebel88 1/2 ton status

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    Usually any shop that does speedometer calibrations can build one for you. That is what I did. Cost about 65 bucks with new gear and everything.

    Later

    Have you driven OVER a Ford lately?
     
  4. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Doing speedometer gears is cake. The cable ends up on the side of the transfer. All you do is open it up and put in a different little plastic gear. Any tranny shop should be able to get you one and they're only a few dollars. I don't what adapter you're talking about you just change the speedo gear ratio in the transfer case.

    June 2001 - The Texas Sawz All masacre begins. Be afraid rust, be very afraid. [​IMG]
     
  5. HarryH3

    HarryH3 1 ton status Author

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    The little adapter goes inline with the speedo cable. There are lots of different gears that can be mounted into it that will make your speedo extremely accurate. You can usually get in the ball park by just swapping the gears on the t-case, unless your tire size and gear ratio don't match up to a factory speedo gear set.

    Speedometer shops use these little boxes to calibrate mechanical speedos so that the head unit is seeing the 1,000 revolutions per mile that it's calibrated for. The number of different gear ratios they can get by mixing and matching gears in that little box is pretty astounding, so they can make your speedo pretty accurate.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     

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