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  1. #1
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    Default Wonky speedometer

    While driving home My speedometer needle started jumping up and down. When I stopped the needle would go down to zero. When I started moving it would start jumping up and down again. all other gauges worked perfect.
    Right away I thought speed sensor and/or gear. So My questions are....

    1.Is the 96 cable speedo or electronic?
    2.I have stock gears and 31inch tires. what speedo gear would I need?
    3.anyone have a part # handy for the speedo gear in a np231?
    4. Anything else I'm not thinking about that could cause my speedo problem?
    One more part and I'll have a new Jeep

  2. #2
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    Default Re: Wonky speedometer

    I think the 96 is drive by wire so it has a pulse sensor. This might be tough to figure out. If it was cable, it would just need a new cable. I never trust those speedo gear charts, they don't seem to come out right for me. I believe stock is 32 tooth. But to get the right gear, you will have to not be like Josh and do the math I would pull the gear and sensor out and check it. If the gear is OK, I would start with the sensor. If that doesn't fix it, it is probably the speedo itself
    230 hp 4.3L Chevy
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  3. #3
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    Default Re: Wonky speedometer

    so long as the gear is connected to the sensor correctly, i would say its the sensor, my 96 sensor hasnt worked right for over 2 years, many miles uncharted...lol
    TO ALL PRESENT, AND FUTURE, OWNERS OF RECREATION VEHICLES: may your days afield be filled with joyful and purposeful activity---but never at the expense of your fellow man, lesser creatures, the soil, woods or water.

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  4. #4
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    Default Re: Wonky speedometer

    Quote Originally Posted by prcjeep View Post
    so long as the gear is connected to the sensor correctly, i would say its the sensor, my 96 sensor hasnt worked right for over 2 years, many miles uncharted...lol
    I'm with you there. I can live with it. I'm a little worried about my daughter driving it. and getting a speeding ticket.
    One more part and I'll have a new Jeep

  5. #5
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    Default Re: Wonky speedometer

    Quote Originally Posted by 4.3LXJ View Post
    But to get the right gear, you will have to not be like Josh and do the math
    That's what I'm afraid of. My Ohio state public education equals out to about a third grade level.
    One more part and I'll have a new Jeep

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    Default Re: Wonky speedometer

    Quote Originally Posted by nickyg View Post
    That's what I'm afraid of. My Ohio state public education equals out to about a third grade level.
    Just drop all the big words and you will be OK
    230 hp 4.3L Chevy
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  7. #7
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    Default Re: Wonky speedometer

    Quote Originally Posted by nickyg View Post
    I'm with you there. I can live with it. I'm a little worried about my daughter driving it. and getting a speeding ticket.
    Just tell her that when the speedo drops, accelerate, and when it goes up, decelerate. It will keep everyone awake
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
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    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  8. #8
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    Default Re: Wonky speedometer

    On my tcase you have to rotate the speed sensor into the proper position. It's really easy to remove. I'd pull it, have a look at the teeth on the gear and then make sure it is rotated, or turned to the right position.

    Not sure if it would cause a problem, but you might want to verify the tcase fluid level. I know they will get hot if not properly lubricated.

  9. #9
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    Default Re: Wonky speedometer

    I've had a problem with mine for years but haven't dealt with it. Not the same issue but am interested in the issue. Also, 96 is an electronic speedo.

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  10. #10
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    Default Re: Wonky speedometer

    Here's a twist.
    Today the alternator crapped out. My red GEN light came on, my tachometer started acting wonky and my speedometer went to zero.

    Changed the alternator and now everything is back to normal.

    Strange luck?
    One more part and I'll have a new Jeep

  11. #11
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    Default Re: Wonky speedometer

    Better wrap it in tin foil Nicky
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  12. #12
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    Default Re: Wonky speedometer

    Stoopid electronics ..


    I'll add that info to my FSM,


    Faulty speedo ... replace alternator .. ..
    I hate watching simplicity and reliability being ruined by bureaucracy and technology.

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    If my jeep is going to be a grocery getter it's at least going to be a friggin awesome one.

  13. #13
    nickyg's Avatar
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    Default Re: Wonky speedometer

    I really think the two problems are unrelated. Just funny timing.

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