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Thread: Speedo question

  1. #1
    Join Date
    Dec 2008
    Location
    ST LOUIS,MO
    Posts
    277

    Default Speedo question

    I have to correct my speedo one of these days and was wondering if the stock speedo will handle around 70 mph speeds ?

  2. #2
    Join Date
    Jan 2011
    Location
    Fernandina Beach, FL
    Posts
    3,689

    Default

    Quote Originally Posted by CHRIS UNGER View Post
    I have to correct my speedo one of these days and was wondering if the stock speedo will handle around 70 mph speeds ?
    Somewhere, I have a picture of my truck in Germany with the needle of the speedometer pointing to "Miles". Needless to say, it was moving much in excess of the highest number...

  3. #3
    Join Date
    Sep 1998
    Location
    North Central Wisconsin
    Posts
    11,532

    Default

    I once had the speedo needle pointing straight down...it didnt give any problems...though I am not sure if it would like it for extended periods.

    I would advise that you grease the speedo cable inside the sheath...randyscycle knows how...maybe he will see this...I think one removes the inner metal part and gives it a coat of lithium grease as it is reassembled...but dont take that as certain until someone verifies it...
    Lord send your Holy Ghost into our hearts and make the desire of our hearts Your Will.

    Pro-choice, that's a LIE, babies don't choose to die!!

  4. #4
    Join Date
    Jul 2007
    Location
    Rhoadesville, Virginia (five miles from no place)
    Posts
    5,125

    Default

    Yup. Just disconnect the cable at the transfer case, (my favorite M715 task) then pull out the inner core. I don't think it will come out the speedo head end, if I remember correctly. I usually clean it really well with either carb cleaner, kerosene or the like, and I also try to clean the cable itself inside by spraying carb cleaner through it until it comes out the other end clean. Then grease up the core with something like John Deere Cornhead grease or something light like that.

    If the speedometer is like most I've ever had apart, there probably wouldn't be any issue with running it past its marked limit. Anything made in the last 40 to 50 years is usually a magnetic instrument, meaning it has a rotating magnet that sits inside a cup connected to the needle. as the magnet spins, it pulls the outer cup along with it in a calibrated way to indicate the speed you are doing. Most instruments have a stop on the high end as well as the rest end, so worst case, it will just hit the stop and nothing more.
    "Free advice is worth what you pay for it."™

  5. #5
    Join Date
    Jun 2009
    Location
    Mt. Prospect, Illinois 60056
    Posts
    2,299

    Default

    70 mph! Wow, you're brave. I keep my truck at about 1/2 that speed. It's not a daily driver, so when I'm in it I'm in no real hurry.
    militarypotts Spec/4 Military Police, Vietnam Era, "Does the noise in my head bother you? Welcome to the Twilight Zone!"

  6. #6
    Join Date
    Dec 2008
    Location
    ST LOUIS,MO
    Posts
    277

    Default

    Well I have some late model axles in mine.

  7. #7
    Join Date
    Dec 2008
    Location
    ST LOUIS,MO
    Posts
    277

    Default

    Thanks for the info.

  8. #8
    Join Date
    Jun 2009
    Location
    Mt. Prospect, Illinois 60056
    Posts
    2,299

    Default

    Quote Originally Posted by CHRIS UNGER View Post
    Well I have some late model axles in mine.
    Well, good luck and hold on.
    militarypotts Spec/4 Military Police, Vietnam Era, "Does the noise in my head bother you? Welcome to the Twilight Zone!"

  9. #9
    Join Date
    Dec 2008
    Location
    ST LOUIS,MO
    Posts
    277

    Default

    I have all late model drivetrain , seat belts and a full cage so it isn't too bad.

  10. #10
    Join Date
    Jan 2004
    Location
    New Haven, CT
    Posts
    1,954

    Default

    I´ve done 85 in mine

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