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  1. #1
    RC Champion olds97_lss's Avatar
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    Rear inside upper ball ends popping off...

    I can't figure out what causes this, but in never fails. Every time I check, the rear upper/inside ball ends on the turnbuckle are popped off the pivot balls. I have a washer on keeping them captured. I've replaced the ball ends multiple times, but it doesn't seem to matter as it happens within the first pack of running.

    It's the blue ends:


    I've replaced with stock, they pop off. As you see, I'm now trying RPM, which seemed to hold up longer, but still pop off.

    Perhaps it's because I run RPM arms? I'm also running alloy axle carriers.

    The fronts do it on occasion, but not nearly as often as the rears.
    https://www.youtube.com/c/olds97lss

  2. #2
    RC Qualifier Rocketzx1's Avatar
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    It could be th extra flex the rpm arms have that cause the turnbuckles to move more, causing the ball end to pop out. Iíd suggest maybe trying out a stock pair of Traxxas arms and see if they still pop out.


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  3. #3
    RC Champion olds97_lss's Avatar
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    Quote Originally Posted by Rocketzx1 View Post
    It could be th extra flex the rpm arms have that cause the turnbuckles to move more, causing the ball end to pop out. I’d suggest maybe trying out a stock pair of Traxxas arms and see if they still pop out.


    Sent from my iPhone using Tapatalk
    Sounds like a plan. Guessing the rustler 4x4 are the latest/greatest to run? I broke a couple stock ones early on which is why I went with RPM to begin with.
    https://www.youtube.com/c/olds97lss

  4. #4
    RC Champion olds97_lss's Avatar
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    Ordered a couple sets of 3655P. I wanted orange, but didn't want to pay what was asked, so got the blue ones instead. Will see how they do.
    https://www.youtube.com/c/olds97lss

  5. #5
    RC Qualifier Rocketzx1's Avatar
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    The stampede 4x4 and rustler 4x4 use the same arms, the only difference are the arms that come with the rustler 4x4 are heavy duty versions.

    Iíve not had any problems with my stock rustler 4x4 arms, though I donít jump my trucks as high as you do.

    Would still be a worth a shot and see if the Traxxas arms limit the flexing. Let us know how it works out.


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  6. #6
    RC Champion olds97_lss's Avatar
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    Seems like there were at least 2 versions of arms that fit, one with sway bar holes, one without and now the 3rd "cold weather" heavy duty version. I went with the latter. Supposed to be more flexible than stock, so hopefully they aren't as flexible as RPM.

    Should get them some time this week and I'll replace all 4 RPM arms with them before my next session to see how it does. Might also replace the rod ends at least on the upper/rear/inside again when I do that, then I'm starting fresh with the new arms.

    I'll post back after I try it out.
    https://www.youtube.com/c/olds97lss

  7. #7
    RC Champion RazorRC22's Avatar
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    What do they look like at full extension and full compression? The shocks should be what's holding back the arms at full extension - if it's the links then that will make them likely to pop off.

    At full compression (push the truck down all the way to the ground), check that the chassis hits the ground first and that it isn't being held back by the links or shocks. If your chassis can't hit the ground, then your tires are too big, shocks are too short, or links are gonna pop.

    If those look OK, then it's most likely going to be the flexy arms.
    youtube.com/c/RazorRCvideos

  8. #8
    RC Champion olds97_lss's Avatar
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    Chassis hits the ground and I can lift the tire 1/2" or so once the chassis bottoms out before the shock fully compresses. The shocks are stopping the arms from dropping, running the GTR's.

    New arms should show up later this week, not sure if I'll have time to install them and get a run in this weekend though.

    I'll post back the results once I do in case anyone else runs into this. I hate finding threads where people ask questions, troubleshoot a bunch of stuff, then there's no end... so you assume they fixed whatever it was, but not sure what they did. lol!
    https://www.youtube.com/c/olds97lss

  9. #9
    RC Champion olds97_lss's Avatar
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    The new HD arms didn't help. So, I tried putting a couple o-rings on the outside of the ball end and that seemed to do the trick. I ran two packs through the stampede on Sunday with a lot of jumping, crashing and whatnot. Both ball ends are still where they are supposed to be! YAY!
    https://www.youtube.com/c/olds97lss

  10. #10
    RC Champion grizzly03's Avatar
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    Quote Originally Posted by olds97_lss View Post
    ...I tried putting a couple o-rings on the outside of the ball end and that seemed to do the trick. I ran two packs through the stampede on Sunday with a lot of jumping, crashing and whatnot. Both ball ends are still where they are supposed to be! YAY!
    Good to hear. Hopefully it fixes it for you.

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