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  1. #1
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    Default Advance Adapters Atlas 2 speed and the electronic speedo

    After installing the Atlas 2 speed in my XJ last night, I tried installing the electronic speedo sensor in the big round hole. I couldn't get it to fit! Now I was pretty tired and maybe I missed something but I'm pretty sure it just doesn't work.

    AA says a NP231 speedo works in there, is there a difference between the NP242 and NP231 speedo sensors?

    Maybe a difference between the TJ and XJ speedos?

    I'll be calling Advance Adapters this morning and talk to them about it.

    Click image for larger version. 

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  2. #2
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    Default Re: Advance Adapters Atlas 2 speed and the electronic speedo

    My 231 speedo sensor worked perfectly in mine. But it is all mechanical
    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

  3. #3
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    Default Re: Advance Adapters Atlas 2 speed and the electronic speedo

    Okay so it seems the gear is too big that I use for my 33" tires and 4.56 gears. I have to take the gear off, fish it in the hole on the other side of the worm gear and then snap it into the sensor. Bottom line it should work. Relieved.

  4. #4
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    Default Re: Advance Adapters Atlas 2 speed and the electronic speedo

    So you need to get another drive gear?
    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

  5. #5
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    Default Re: Advance Adapters Atlas 2 speed and the electronic speedo

    Well according to AA speedo chart the gear is the same for NP242 or the Atlas, so no. I won't know for sure until I get it installed and can test drive to verify.

    Quote Originally Posted by 4.3LXJ View Post
    So you need to get another drive gear?

  6. #6
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    Default Re: Advance Adapters Atlas 2 speed and the electronic speedo

    Is it the length of the shaft on the gear giving you problems. There is a short and long shaft
    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

  7. #7
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    Default Re: Advance Adapters Atlas 2 speed and the electronic speedo

    I was told it is the diameter of the gear that is the cause of putting it in, in one piece. The gear goes in first, then you hook it up to the sensor. What I have is short shaft.

    Quote Originally Posted by 4.3LXJ View Post
    Is it the length of the shaft on the gear giving you problems. There is a short and long shaft

  8. #8
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    Default Re: Advance Adapters Atlas 2 speed and the electronic speedo

    I believe mine is the long shaft. Also the sensor housing rotates depending on the tooth count of the gear. Got it colcked right?
    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

  9. #9
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    Default Re: Advance Adapters Atlas 2 speed and the electronic speedo

    Got it in. Took the gear off then stabbed it with the sensor once I had the gear behind the worm gear. Rotation? Who knows? I have no reference point on the Atlas (or experience). I'll try rotating the output shaft prior to driving it to make sure nothing is binding, then it will be drive and see!

    Quote Originally Posted by 4.3LXJ View Post
    I believe mine is the long shaft. Also the sensor housing rotates depending on the tooth count of the gear. Got it colcked right?

  10. #10
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    Default Re: Advance Adapters Atlas 2 speed and the electronic speedo

    No, what I mean is that the center of the sensor is offset so that by rotating it you can accommodate different size, toot count, gears. You have to have the proper rotation position or the speedo will not work
    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

  11. #11
    Join Date
    Mar 2009
    Location
    Katy, Texas
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    Default Re: Advance Adapters Atlas 2 speed and the electronic speedo

    Yep, I think I've changed the gear at least three times now. Twice on the XJ and once on the TJ. In fact I need to get Mandy to verify the speedo is reading correctly on the 2001 TJ she bought.

    I think it was the TJ that I changed it and the speed odometer wouldn't work. Had to rotate it to the next set of notches.

    Quote Originally Posted by 4.3LXJ View Post
    No, what I mean is that the center of the sensor is offset so that by rotating it you can accommodate different size, toot count, gears. You have to have the proper rotation position or the speedo will not work

  12. #12
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    Default Re: Advance Adapters Atlas 2 speed and the electronic speedo

    lol now that I have the cross member back in I see I have to mark it where it's 1/16" from the transfer case, remove it, trim it and reinstall it. :S

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