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  • speedometer offset

    hey i have a 3'' lift with 31's with stock gearing
    does anyone know how this affects the speedometer reading? probably either just high or low by a few mph right? and then would that also affect the true odometer reading? thanks cause i was considering if it was worth adjusting so it was correct
    and i did do a forum search but couldnt really find much

  • #2
    here is a gear chart but as far as a chart to let you know how off one is I've never seen one.

    It's about tire size and gears the lift won't have much to do with it.

    http://jeephorizons.com/tech/rpmchart.html

    http://www.links4jeeps.com/link.php?id=102

    http://www.links4jeeps.com/link.php?id=70

    This is what I need to do asap. I'm running stock 3:55 gears on 33x12:50s and I'm guessing I'm off by 3 to 5 miles or so.

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    • #3
      Or you can drive by one of those police radar stands and see how far off you are on your speedometer...That's what i do :P

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      • #4
        Originally posted by KeepOnMudding
        Or you can drive by one of those police radar stands and see how far off you are on your speedometer...That's what i do :P
        that doesn't always work. Say if I'm under 30 MPH the spead is just fine I get up to 55 on my speedo and one of those things would be off a few miles then going faster off even more. So it's not a bad thing to just pay the 15 bucks and get the new gear.

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        • #5
          My whole speedo cluster is shot, I just use my GPS for a speedometer, and put gas in once a week! (already have an aftermarket temp guage)

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          • #6
            Originally posted by Hill, Bill E
            My whole speedo cluster is shot, I just use my GPS for a speedometer, and put gas in once a week! (already have an aftermarket temp guage)
            now thats funny yet don't feel bad your not the only guy I know that does that.

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            • #7
              i don't know anyone who uses it in a vehicle, only on vessels haha

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              • #8
                Originally posted by KeepOnMudding
                i don't know anyone who uses it in a vehicle, only on vessels haha
                use what in a vehicle GPS?

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                • #9
                  use what in a vehicle GPS?
                  Thats what I was wondering.

                  GPS is great in your Jeep when your driving new areas, or going "4X4 Geo Caching" You can transfer where you've been to topo maps, mark waypoints for good obstacles or interesting features. There are a lot of uses.

                  I don't need it for navigation though, I've NEVER been lost in the woods, confused for a week or so, but never lost!!

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                  • #10
                    Originally posted by Hill, Bill E
                    I've NEVER been lost in the woods, confused for a week or so, but never lost!!
                    Is that what happened to last week??????

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                    • #11
                      Is that what happened to last week??????
                      Ya mean next week last week? As in the posts on March 11th? I think so!

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                      • #12
                        Originally posted by jdogg4
                        use what in a vehicle GPS?
                        The speedometer on the gps, only person i know who uses that hasa ghenoo and no speedometer on there, so he uses his gps

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                        • #13
                          A lot of guys use them in their cars and jeep and what not. the new map ones are all gps navigation setup and you can do some really cool stuff with them. Tell them what size tank you have and it will average your mph fuel usage and now manymiles tell you need gas. Great for docking up to a pc and downloading trails you been on.

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                          • #14
                            It's not that strange...I use my GPS when driving the CJ...but then that's on stock gearing and 35's when I get up to 75 the speedometer reads at about 55...

                            Jdogg...thanks for the recalibration links...I've been looking for em, but must have gotten deleted when we decided to sell the XJ...now that we're keeping her I need to get it recalibrated (especially where the lead foot wife will be driving her daily).

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                            • #15
                              Originally posted by mdwatkins
                              It's not that strange...I use my GPS when driving the CJ...but then that's on stock gearing and 35's when I get up to 75 the speedometer reads at about 55...

                              Jdogg...thanks for the recalibration links...I've been looking for em, but must have gotten deleted when we decided to sell the XJ...now that we're keeping her I need to get it recalibrated (especially where the lead foot wife will be driving her daily).
                              same here I need to get it done I keep thinking I'm going faster than I should be at times but then other times I feel like I'm going so slow when the speedo shows over the limit.

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