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  1. #1
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    MIPs Diff Out wobble and play

    Hey guys,
    i am a litte worried about this wobble and play of the MIPs at the Diff Out. I could not find the source.

    Bearing, Diff, Diff housing seem ok

    So i made a short video.

    Maybe someone has an idea?

    http://www.youtube.com/watch?v=9J78NryEXdw

    THX!

  2. #2
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    I just checked mine. It moves by hand just like yours in the video. It maybe normal. Have you taken it apart to check anything?
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  3. #3
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    Yes i have taken it apart (not the diff itself) but everything else. Could not find where the play comes from.

  4. #4
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    I bet it is from the bearings. They may be fine to spin by hand, but the center race could possibly rock side to side and when attached to the axle shafts. The further away from the bearing, the larger the side to side movement becomes. Try packing the bearings with a light grease. May reduce it. These bearings don't have a preload like the ones in a full size truck differential. There for there is nothing to stop them from wiggling over time as they wear in.
    Last edited by ramflames; 09-16-2013 at 05:54 PM.
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  5. #5
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    Nope bearings are fine: i just opened everthing up again and found where the play comes from. It's from inside the diff. Probably just worn out a little. I had another used diff case here and replace the other one with that but no difference.

    Just ordered a rebuld Kit. maybe a new diff case will help a little
    Last edited by soundmaster; 09-16-2013 at 06:26 PM.

  6. #6
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    While your in there upgrade to an xo-1 I beam if you plan on running 3s, I snapped my stock one clean in half

  7. #7
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    Quote Originally Posted by soundmaster View Post
    Nope bearings are fine: i just opened everthing up again and found where the play comes from. It's from inside the diff. Probably just worn out a little. I had another used diff case here and replace the other one with that but no difference.

    Just ordered a rebuld Kit. maybe a new diff case will help a little
    I'm curious as to where the play comes from inside the diff cup because mine also does the exact same thing with yours in the video you have. Inside my diff cup I have TRA6882X front and rear which is why I am curious where your play is coming from.

    http://buy.traxxas.com/product_info....oducts_id=9335

  8. #8
    RC Turnbuckle Jr. spenniepoos's Avatar
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    Dude mine have the same amount of play and have done for 2 years and still going strong........peace
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  9. #9
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    In the front it is much better though.

  10. #10
    RC Turnbuckle Jr. spenniepoos's Avatar
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    I have just checked mine and my rears have more play than the fronts dude.....peace
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  11. #11
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    I run Tekno's, shimming was my solution, part # 1985.

    http://buy.traxxas.com/advanced_sear...partsearch.y=0
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  12. #12
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    I installed all new gears with the support bar over winter. In both diff's. I currently have the same play. I hope the gears are not wearing that quick. After you rebuild your, Let us know how it is after.
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  13. #13
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    I think it is rather the plasic of the diff case than the gears that create the slop.

    The metal gears don't show any wear at all.

  14. #14
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    Quote Originally Posted by soundmaster View Post
    I think it is rather the plasic of the diff case than the gears that create the slop.

    The metal gears don't show any wear at all.
    Doesn't someone make diff housings out of aluminum?
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  15. #15
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    Quote Originally Posted by ramflames View Post
    Doesn't someone make diff housings out of aluminum?
    sure - but honestly i wouldn't mind too much about this wobble.

  16. #16
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    The problem I see with it is harmonics. A wobble in a rotating shaft, at high RPM, will cause wear on other items like bearings. Plus, it will reduce performance by robbing power and over working the motor. It's like driving a full size truck with a bad U-joint. Very unpleasant to drive and shakes everything, reducing fuel economy and drivability.
    Last edited by ramflames; 09-17-2013 at 05:42 PM.
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  17. #17
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    Quote Originally Posted by ramflames View Post
    The problem I see with it is harmonics. A wobble in a rotating shaft, at high RPM, will cause wear on other items like bearings. Plus, it will reduce performance by robbing power and over working the motor. It's like driving a full size truck with a bad U-joint. Very unpleasant to drive and shakes everything, reducing fuel economy and drivability.
    As a mechanic I would want to find out but as for this hobby it isn't that serious for me yet but some it might be if they're needing it to be perfect.

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