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Speedometer Reads Higher After Gear Change 4.56

  1. ZrowGz

    ZrowGz [OP] I'm a n00b.

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    Compared to GPS, my speedo reads high.
    1997 taco that had been regeared to 4.88
    What is the part that I need to swap in to become it reading accurately. It besides has 33" or 32" tires on it...
    Anyone have a link to a thread that illustrates it better?
    Thanks!
  2. tony2018

    tony2018 Well-Known Member

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  3. nzbrock

    nzbrock Well-Known Member

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    You tin can swap the speed sensor gear for one with a different corporeality of teeth. On 4WD trucks information technology is located on the transfer case. On 2WD trucks it is located on the transmission.
    I used this thread as a reference: https://forum.ih8mud.com/threads/speedometer-correction-by-t-instance-gear-change.480939/

    Since yours is a 97 it may have a mechanical speedometer cablevision. If so, look at the charts in that thread and only look at ones that apply a mechanical cable.

  4. onakat

    onakat Well-Known Fellow member

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    your speedometer is off considering of your bigger tires (and maybe the regearing itself)
    use the tire size calculator and do some experiments:
    https://www.tacomaworld.com/tirecalc
  5. turbodb

    turbodb AdventureTaco

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    Hither are a couple links that will help you out. The office number you lot demand is likely a speedo gear.

    Why your speed is off:
    Speedometers, Odometers, and Gas Mileage - All Lies!

    How to prepare it:
    Replacing the Speedo Gear

    Terminal edited: April x, 2018
  6. ZrowGz

    ZrowGz [OP] I'm a n00b.

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    Excellent! Thanks. I'll take a look through these.

    Yeah it is a mechanically driven Speedo with 4wd. The larger tires would make it read slower than real speed while the rehearsal would go far read fast I believe.

    And so yes I call up I just demand a great. But wasn't sure what her it would exist and how to find the part number and where to buy it. Looks similar I should exist able to figure it out from those links!

  7. boostedka

    boostedka Well-Known Member

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    Use Dakota Digital. It'due south easy to do. Only iv wires...power, ground, and speed input and output. It will make your speedo more accurate than the tooth swap.
    https://www.amazon.com/dp/B014N07F8...colid=7O2GROMZWZRO&psc=0&ref_=lv_ov_lig_dp_it

    Edit: I simply saw yours is a 97. If it's mechanical then this probably won't piece of work.

  8. nzbrock

    nzbrock Well-Known Member

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    These are your options taken from here: https://forum.ih8mud.com/threads/speedometer-correction-by-t-case-gear-alter.480939/page-2

    33482-39135 eighteen tooth, 18x6 marking RN10*/RN110/RN13*
    33482-39025 19 tooth, 19x6 marker TCR1*
    33482-39045 20 tooth, 20x6 mark RN106/RN110/RN13* (ATM)

    33403-39345 31 tooth, 31x11 mark RN131 (ATM)
    33403-19255 32 molar, 32x11 mark RN10*/RN110/RN13*
    33403-29115 33 tooth, 33x11 mark VZN10*/VZN110/VZN13*

    Y'all need to determine your stock gear by plugging your VIN into ToyoDIY.com. You tin search for "speedometer driven gear" once you have your VIN plugged in. You also demand to know the stock tire size and gearing so that you tin can summate the alter in ratio based on your new tire size and gearing.

    I believe if you have to stay with whatever "mark" you have stock.

    If your speedo reads fast, that means your current speedo gear is also small and is spinning to fast. You need to replace information technology will a larger gear.

    If your speedo reads dull, that ways your electric current speedo gear is too large and spinning also slow. You need to replace it with a smaller gear.

  9. shawnster88

    shawnster88 Well-Known Member

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    OME 881 ringlet springs, OME nitrocharger sport shocks front and rear. Nitro 4:56 gears. ARB rear locker. Shrockworks front bumper with Warn M8000S winch.
    Bully info!!! My speedo is showing 65 when I'm really going 60 by gps. Stock fix upwardly was 3:58 gears and 225/75/15. At present I have 4:56 gears and 265/75/16 tires. I have the thirty tooth speedo gear in the diff. I know I'll need bigger since my speed is showing higher. How can I figure if I'll need the 31,32, or 33 molar gear?
  10. nzbrock

    nzbrock Well-Known Fellow member

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    You tin either summate information technology past using exact gear ratio to tire size changes, or more just by using the speedo gear and mph. The gears and tires volition probably exist more accurate, but you only have a couple options to choose from as far every bit speedo gears go.

    one - (lx/65) =~viii%
    therefore you need a speedo gear that is ~8% larger.

    one - (30/33) =~9% is probably as shut as you're going to become.

    Also, go along in listen that your stock speedometer is usually off by a certain amount. Sometimes you can actually become it more than exact when changing the gear after irresolute your differential gears and tires.

  11. shawnster88

    shawnster88 Well-Known Member

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    OME 881 ringlet springs, OME nitrocharger sport shocks front end and rear. Nitro iv:56 gears. ARB rear locker. Shrockworks forepart bumper with Warn M8000S winch.
    Awesome...I didn't even know this could be done. Thanks for the info!!!
  12. se7enine

    se7enine MCMLXXIX

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    I planned on doing this but after I adapted my scangauge to compensate I kinda didn't bother. Still oughta though.
  13. Vision10

    Vision10 Well-Known Member

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    Mine does the exact same affair
  14. I just had my 1998 regeared with 4.56 nitro gears and my tires are 265 78 16. I replaced the speedo gear with the 33 tooth and now the all is with in 1MPH. Truck 2.7 with transmission 5 speed.
  15. Make that 265 75 sixteen Falken Wildpeak AT3W

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Source: https://www.tacomaworld.com/threads/speedometer-reads-about-10-faster.543354/

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