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Thread: JKUR broken rear axle shaft

  1. #1
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    JKUR broken rear axle shaft

    Hello,

    Last trip I made to JJUSA in Bethel Maine I broke my rear left axle shaft on my first day losing my whole week end....

    I was full lock in a steep rock garden and was slowly going reverse to get in better position and axle suddently snap...

    I have a 2016 JKUR stock gears on stock 44 with 37 inch STT Pro tires. My dealership cover the shaft under warranty so nice but I dont want that to happen again so I was wondering if getting chromoly shafts is really worth it and would have saved my week end?

    If chromo shafts are really needed to run 37 do you have any recommendations?

    Thanks

  2. #2
    Nothing but a Thing desertrunner's Avatar
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    In what manner did it break? Twisted spline snapped in by the carrier?
    Snap by the flange?

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    ***SOLD*** 08' JKU Rubicon 6-speed Stone White, 3.5" RK lift, 37" KM2s and lots more.
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  3. #3
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    Quote Originally Posted by desertrunner View Post
    In what manner did it break? Twisted spline snapped in by the carrier?
    Snap by the flange?

    Sent from my SM-G950U using WAYALIFE mobile app
    Unfortunately I wasnt there when dealership chage it and they wasnt able to told me. But I think it wasnt snap by the flange since I was able to run around a mile on it to get out of the trail. Pretty sure near the carrier.

    Why are you asking?

  4. #4
    Administrator wayoflife's Avatar
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    It's a shame you didn't see the break as you could have learned a few things from it. If I could guess, you had twisted splines before getting to Bethel and then it finally let go on the trail. Chromoly shafts would be stronger but more splines would be even better. Of course, to do that, you'd need to be running a different locker/carrier.

  5. #5
    Addict wjtstudios's Avatar
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    If you were able to drive it at all, it wasn’t broken, just severely bent. When a SF breaks, the wheel practically and can fall off the Jeep.

    There are better shafts out there from Revolution, Ten Factory, and Carbon. But no matter what, it will always be a risk. Check out this thread:

    Dynatrac ProFloat XD60 Axle
    https://wayalife.com/showthread.php?t=58840

    Not for the ProFloat, but for the discussion of how and why a Semi Float Axle can fail. All Jeeps come from the factory with SF rear axles. But when you really start pushing your Jeep on bigger tires, going to a full float axle is a very good idea.


    2015 JKUR AEV JK350
    1985 CJ8 Scrambler
    2015 JKU Rubicon AEV JK350
    1985 Jeep CJ8 Scrambler

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    So stock axle shaft over chromo 32 splines does not really worth it? Better save my money to get new axle or upgrade to 35 splines ?




    Sent from my iPad using WAYALIFE mobile app

  7. #7
    Addict BaddestCross's Avatar
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    Quote Originally Posted by JFLAMBERT View Post
    So stock axle shaft over chromo 32 splines does not really worth it? Better save my money to get new axle or upgrade to 35 splines ?




    Sent from my iPad using WAYALIFE mobile app
    If you're going to get new shafts, get chromoly. If you're gonna get 60s, get a full float.



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  8. #8
    Nothing but a Thing jdofmemi's Avatar
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    Quote Originally Posted by wjtstudios View Post
    If you were able to drive it at all, it wasn’t broken, just severely bent. When a SF breaks, the wheel practically and can fall off the Jeep.

    There are better shafts out there from Revolution, Ten Factory, and Carbon. But no matter what, it will always be a risk. Check out this thread:

    Dynatrac ProFloat XD60 Axle
    https://wayalife.com/showthread.php?t=58840

    Not for the ProFloat, but for the discussion of how and why a Semi Float Axle can fail. All Jeeps come from the factory with SF rear axles. But when you really start pushing your Jeep on bigger tires, going to a full float axle is a very good idea.


    2015 JKUR AEV JK350
    1985 CJ8 Scrambler
    Not to argue, but the way the wedding band holds the bearing to the shaft, if the break is by the splines, you can still drive it, at least on a JK.

    I broke a shaft last year in Big Bear, and drove the rest of the trail, plus all the way home with no problem.

    The design of the shaft is such that if it fails by torque load, it will normally break at or near the splines, so you can still drive.

    If it breaks due to a side load or impact load, it may break outboard of the bearing, and the wheel will fall off. This is less likely, as usually it will bend but not break, except for extreme impacts.

  9. #9
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    Quote Originally Posted by BaddestCross View Post
    If you're going to get new shafts, get chromoly. If you're gonna get 60s, get a full float.



    --
    Build Thread - Adventures of Fiona - https://wayalife.com/showthread.php?t=47407
    Problem is I got a new stock shaft driver side and checked passenger side today and all good splines straight so do I really need to get chromo anyway to avoid breakage ?

    I only see bent flanges with stock or SF axles and dont really see any shaft break problem with stock shafts so honnestly when all of you guys build new jeep on 37 with stock axle are you throwing away your axle shafts to get chromo or just replace them with chromo when it broke?


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  10. #10
    Addict wjtstudios's Avatar
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    Quote Originally Posted by jdofmemi View Post
    Not to argue, but the way the wedding band holds the bearing to the shaft, if the break is by the splines, you can still drive it, at least on a JK.

    I broke a shaft last year in Big Bear, and drove the rest of the trail, plus all the way home with no problem.

    The design of the shaft is such that if it fails by torque load, it will normally break at or near the splines, so you can still drive.

    If it breaks due to a side load or impact load, it may break outboard of the bearing, and the wheel will fall off. This is less likely, as usually it will bend but not break, except for extreme impacts.
    Valid point. I was thinking and describing an outer break verses at the spline.


    2015 JKUR AEV JK350
    1985 CJ8 Scrambler
    2015 JKU Rubicon AEV JK350
    1985 Jeep CJ8 Scrambler

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