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  1. #1
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    Unhappy Spun three u joints out of driveshafts

    I have a mini summit and kids today spun three u joints out of drive shafts in less than one run on 2 2s packs in parallel. It's the first time any u joints spun out of ears, sense putting merv driveshafts in place of summit CV joints.
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  2. #2
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    Um I put this post on the merv board, because I'm talking about merv parts.
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  3. #3
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    Quote Originally Posted by USA1 View Post
    Um I put this post on the merv board, because I'm talking about merv parts.
    Sometimes I think u have to post on the MERV board for any 1/16th because it seems to be the only really active 1/16 board!
    What broke, uh, needs upgrading now?

  4. #4
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    Exactly

    Has anyone tried to use the next size bigger sliders?
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  5. #5
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    Plastic does wear over time and use...
    How long have you used these shafts?
    How many runs?
    2S? 3S?

    Another option is to use Rustler joints... they are similar in size but have longer pins making them harder to twist out.
    Whatever it is I just said... I could be wrong.

  6. #6
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    Not long I mean I got the truck Christmas, broke summit cvds one by one replacing with merv as I went. I'm stock ran NiMH most time in parallel. 2s last 3 months or so
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  7. #7
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    I don't know what's going on the kids keep spinning half shafts off u-joints!
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  8. #8
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    It sounds like something isn't setup correctly. Either that or things are heating up from running too long. I haven't broken a shaft yet since switching to merv shafts.

  9. #9
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    It's fixed. It was a combination of stuck slipper clutch, and super thick diff oil. It hasn't happen again. But I now have a center diff, and a new slipper clutch.
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  10. #10
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    Quote Originally Posted by USA1 View Post
    It's fixed. It was a combination of stuck slipper clutch, and super thick diff oil. It hasn't happen again. But I now have a center diff, and a new slipper clutch.
    slipper could definately do it. I have mine on the looser side since my son still tends to hit the forward instead of reverse and vice versa against solid objects.

  11. #11
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    Right My sons pretty good now, for three.
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  12. #12
    RC Turnbuckle Jr. mwe-maxxowner's Avatar
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    Quote Originally Posted by Jimmie Neutron View Post
    Plastic does wear over time and use...
    How long have you used these shafts?
    How many runs?
    2S? 3S?

    Another option is to use Rustler joints... they are similar in size but have longer pins making them harder to twist out.
    Are you saying just use the rusty pivot balls? Or are you modifying rusty shafts and using them?
    460, straightpipes, buried throttle, nuff said :D

  13. #13
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    Just using the rusty pivot balls, they should pop in there, but it is a tight fit. They are a little bigger, but the shafts are longer, and are harder to twist out of yoke.
    T-maxx 3.3
    Rusty 2.5r
    Summit VXL
    Nitro 4-tec

  14. #14
    RC Turnbuckle Jr. mwe-maxxowner's Avatar
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    That might be worth giving a shot! I have several old busted shafts running around. I've neveriked opening the joint to pop pivot balls in, because I've always found they pop out easier after it's opened up once. This was always with stock sized pivot balls, though. May do better with larger ones.
    460, straightpipes, buried throttle, nuff said :D

  15. #15
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    It works pretty good, I have lots of stock rusty pivot balls laying around. I have shredded my fair share in the years I have owned it. I now run the nitro slash shafts in my rusty. I still break one sometimes, depending on the tires I have on. They are a stronger than stock though.
    T-maxx 3.3
    Rusty 2.5r
    Summit VXL
    Nitro 4-tec

  16. #16
    RC Turnbuckle Jr. mwe-maxxowner's Avatar
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    Awesome tip! My merv (with canyon tires) I am looking to convert to full summit spec. It currently has some pretty nice dogbone style cvds. I think I've gathered these won't work well with summit rockers and arms. Not on the rear anyway. So when I rebuild the rear end I may install merv shafts with rusty pivot balls. The truck has a 4420 kv BB motor, though, so they need to be stout.

    I wish traxxas would design their plastic shafts with a metal "collar" around the plastic ears at the pivot balls. I think this would greatly reduce shaft failure. I have had more shafts start just popping apart at the pivot balls than all out break.
    460, straightpipes, buried throttle, nuff said :D

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