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Thread: Correcting your Speedometer

  1. #1
    Mountain Valley Customs
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    Default Correcting your Speedometer

    This is a really simple tech article, but it will help you correct your speedo after changing gears and/or tires.

    What You Will Need
    • Appropriate Speedometer Gear (See Chart below)
    • 1/2" Socket or Wrench
    • Ratchet
    • Rag

    Installation
    1. Determine what speedometer gear you need by using the chart on the left. Select what gear ration you have and look across to the tire size you just installed and where the two meet, that's the tooth gear you will need. The part number you will need to ask for will be 520676 + the tooth number. For example, if you need a 34 tooth gear, the part number would be 52067634.

    2. Climb under your Jeep and locate the speedometer gear housing. It will be attached to the rear of your transfer case on the driverside.
    3. Using a 1/2" socket or wrench, remove the retaining bolt and clip.

    4. Firmly grab the speedometer gear housing and pull the entire thing out of the transfer case. You may need to rock it back and forth a bit to do this. Be sure to have a rag handy as ATF will drip.

    5. Inspect the rubber O-ring on the housing for cracks or damage.

    6. Hold the speedometer gear housing in one hand and the gear itself in the other and then carefully pull them apart.

    7. Take your new speedometer gear, lube the shaft just a bit with the ATF in your transfer case, and then plug it into the housing.

    8. Make sure the rubber O-ring is seated properly and then re-insert the assembled speedometer gear and housing back into the transfer case.

    9. You will notice that there are a series of number located along the side of the speedometer gear housing. Select the appropriate tooth gear range you just installed and rotate it until it is aligned with the raised dot on the transfer case as shown in the pic to the left.

    10. Re-install the retaining clip and bolt.


    Mountain Valley Customs www.mvcustoms.com 570.217.7284
    Specializing in 4x4s and custom fabrication


  2. #2
    The Cow Shall Rise Again theyeti1775's Avatar
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    Cool, good write up.

    I just went with the theory lift it enough where ya don't want to speed. LOL.
    Yeti

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  3. #3
    usnavymitchells
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    Quote Originally Posted by theyeti1775 View Post
    Cool, good write up.

    I just went with the theory lift it enough where ya don't want to speed. LOL.
    Great write up. I use the construction site radar signs and visual spedometer check.LOL

  4. #4
    This spot taken? Allium's Avatar
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    Using the above signs I figured with 33's Im at a 10% differance.


  5. #5
    Back to 1 Jeep... for now rroadkilll's Avatar
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    Quote Originally Posted by Allium View Post
    Using the above signs I figured with 33's Im at a 10% differance.
    That's funny... With my 31's I'm 10% off!!!

  6. #6
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    I forgot to mention, as far as I know, if you are running a 231 t-case, this technique will work for you.
    Mountain Valley Customs www.mvcustoms.com 570.217.7284
    Specializing in 4x4s and custom fabrication


  7. #7
    Junior Member texascj's Avatar
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    FYI for anyone with a Dana 300 looking for speedo gears to correct. I have 2.73 gears in my CJ so any chart, including the one in the original post, doesn't cover the ratio. What to do? Well, a few months ago I spoke to Woody at 4WDH and he told no one makes gears for the Dana any longer. This seems like a income opportunity for some one to get into. So, if anyone gets enterprising enough to make the gears please let me know...I was getting tired of being pulled over and explaining everything. At least before the Jeep went on jack stands a year ago.
    81 CJ7, 30 over 258, did the Weber thing now I'm going with a Howell injection kit, 2.5 lift, SRS, and the all important M998 instrument panel with Equus gages. Also have a 71 AMC 360 to rebuild when I kill the 258.

  8. #8
    Mountain Valley Customs
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    I have a Dana 300 that I swapped into m TJ and I used the above chart and write-up to correct my speedo. Even with the 2.62 in the D300, you will be within a mile-an-hour or two. The gears on the above char refer to your axle gears so your t-case shouldn't matter.
    Mountain Valley Customs www.mvcustoms.com 570.217.7284
    Specializing in 4x4s and custom fabrication


  9. #9
    Gone Wheelin' beecee's Avatar
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    Correct me if I'm wrong, but I think TJ's, '03 to present need the Box to correct your speedo gears. Digital garbage connected to the transfer case. Pretty costly if you ask me. I too, use the flashing radar sign to guage speed.
    Bill Collins
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  10. #10
    Mountain Valley Customs
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    Quote Originally Posted by beecee View Post
    Correct me if I'm wrong, but I think TJ's, '03 to present need the Box to correct your speedo gears. Digital garbage connected to the transfer case. Pretty costly if you ask me. I too, use the flashing radar sign to guage speed.
    No you don't. My Jeep is an '04 and I used the above technique and it worked in mine just fine.
    Mountain Valley Customs www.mvcustoms.com 570.217.7284
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