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regearing speedomoter

Discussion in 'Under the Hood' started by toddious, December 6, 2004.

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  1. toddious

    toddious Well-Known Member

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    so i know that when i put 33's on my truck, that i am going to have to regear the speedomoter to make it accurate. this is possible for 33's right? and also, will regearing the speedo make the information on the message center (the display that says 'miles to empty' and all that) correct too? or will i have to reprogram that seperately somehow? thanks, todd.
     
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  3. bmxking5

    bmxking5 Well-Known Member

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    If you don't have a speeedo tooth(I think that they are only in 1st gen X's), you'll have to buy a speedo calibrater. I know Superlift makes one but not sure on anybody else. I think that if you correct the speedo it should fix the miles to empty as well.
     
  4. bmxking5

    bmxking5 Well-Known Member

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  5. RiverRat

    RiverRat Well-Known Member

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    Look up "yellow box". Some car guys use this box to "modify" the vss signal. I think it's $90.

    If you get a aftermarket box you should hook it up before the message center, cluster, and engine computer. That way everything gets the correct vehicle speed reading.

    yellow box
     
  6. Bronco638

    Bronco638 Nobody Home

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    Todd,
    My '96 has speedo gears that can be changed. My speedo is driven off the t-case. I was able to find the Ford Part numbers as well as the tooth count and gear color (different gears are molded in different colors) on the Ranger Station. If you can't find that thread, I can email the chart I downloaded.

    D.
     
  7. toddious

    toddious Well-Known Member

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    so you're saying i should be able to do it with a gear? and what about the computer? will i still need that to be reset? thanks, todd.
     
  8. section525

    section525 sextion525 Elite Explorer Moderator Emeritus

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    Todd... If you're 3.73s stock I can tell you what color gear you'll need for the 33s. (I'll have to pull my gear out tomorrow to make sure.. but I'm pretty certain its a 19 tooth gear).
     
  9. Opera House

    Opera House Well-Known Member

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    The tooth values go from 16 to 21 and gives you about 5% change per tooth. Adding a tooth slows it down. Speedo gear used in the transfer case was first designed in the sixties. Parts guy asked me if I had an old Comet when I gave him the part number. I went to a 21 tooth to correct a bad speedometer, a cheap fix.
     
  10. Bronco638

    Bronco638 Nobody Home

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    Todd,
    I'm not aware of the "computer" in my truck (something in the Limited?). My speedo is gear driven (as is yours, I think). Hopefully Section 525 will be able to provide a tooth count. Otherwise, like Opera House says, these gears are cheap and available from Ford. A tooth count helps but I also understand they're molded in different colors (to indicate tooth count).

    Dave.
     
  11. lowflyingbird

    lowflyingbird Active Member

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    Hi,
    This is great info, wondering if you could help me out . I have a 1999 Explorer with a 3.73 rear. I just changed from stock 235 75 15 to 255 65 17. Ofcourse they are taller. I can only guess that I'd only need a single tooth change on gear from stock(guess) do you know which color equals what tooth quantity?
    Please reply
    THankyou
    Keith
     
  12. toddious

    toddious Well-Known Member

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    the computer i am talking about is the message center in the lower console area. tells me 'miles to empty' , 'average miles per gallon', 'gallons to empty', and all that kind of stuff. should it be getting it's mileage information from the same gear though? thanks, todd.
     
  13. RiverRat

    RiverRat Well-Known Member

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    the message center, temp/compass, EEC computer, GEM, etc all get the vehicle speed info from the vehicle speed sensor on the 1996 Ex.
     
  14. Opera House

    Opera House Well-Known Member

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    I think by 99 the transfer case speed sensor was eliminated and speed was taken from the rear differential sensor. The computer needs to be reprogrammed. No cheap gears to change.
     
  15. Doug904

    Doug904 Sponsor

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    Here's a link to the tire size calculator I use when I'm adjusting for them in the PCM's, which didn't really start till around 98-99'


    http://www.1010tires.com/TireSizeCalculator.asp

    This has a comparison feature that will tell you the differences between your tire sizes and speedo ratings as the big feature is it has it in American sizes, not just metric.

    Later Doug.
     
  16. toddious

    toddious Well-Known Member

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    so basically, this is the bottom line? where could i get this computer reprogrammed? is there anyone on here that knows how? thanks in advance, todd.
     
  17. Doug904

    Doug904 Sponsor

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    I don't beleive the value's are in the PCM for a 96 model Explorer for the speedo, It didn't start until the later 98-99 models. Now it may be in the GEM module but you'd have to find a local dealer that knew how to use a NGS to reprogram it and it would probably cost you more then a simple speedo gear swap.

    Doug.
     






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