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Thread: Rear diff leak?

  1. #1
    RC Enthusiast
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    Rear diff leak?

    One of my axle shafts (where it exits the diff), has a greasy wet residue. Is there a seal that could be leaking? Or do you think it could be a bad bearing (I didn't see a seal on the parts list).

    I see two part numbers on the parts list for the bearings 5118 and 5119, are there different left to right?

  2. #2
    RC Champion thesmogman's Avatar
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    Traxxas just sells the complete diff rebuild kit which includes two seals for the outdrives. One seal for the diff cup. The diff cup and a fiber washer for the one side outdrive that needs it.

    The seal often tears and a leak develops over time.

    It is probably not the bearings and yes they are two different sizes.
    Slash 4x4 Tekin RX8GenII w/Pro4 4300hd

  3. #3
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    http://store.leadingedgemachining.ne...-p/lem-102.htm

    I use these and no more leaking issues at all.
    just a basher

  4. #4
    RC Turnbuckle Jr. Jezza's Avatar
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    +1 on what pro mod steve mentioned, its very possible that rebuilding the diff is not necessary to merely changing the O rings.
    Last edited by Jezza; 06-10-2016 at 08:26 PM.
    Live life to the fullest

  5. #5
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    Where are the O-Rings located?

  6. #6
    RC Turnbuckle Jr. Jezza's Avatar
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    Quote Originally Posted by RossL View Post
    Where are the O-Rings located?
    Have a lok at the exploded views of the diffs
    Quote Originally Posted by Jezza View Post
    I actually used the erevo diffs including the erevo diff output shafts...

    This is the refference I used to build my diffs,

    https://traxxas.com/sites/default/fi...-ML-121120.pdf
    Live life to the fullest

  7. #7
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    Are the O-Rings part of 5381?

  8. #8
    RC Champion thesmogman's Avatar
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    Quote Originally Posted by RossL View Post
    Are the O-Rings part of 5381?
    I use 3978 it comes with the side plates and the O-rings which makes the diff stronger. You can also get 6882x which includes the internal gears and the I bar.
    Both of these make a XO-1 diff with 5mm outdrives which is the strongest for the slash. You have to watch that you don't confuse the slash parts with the revo parts, the revo has 6mm outdrives. You can use them but you have to switch out more parts.
    Slash 4x4 Tekin RX8GenII w/Pro4 4300hd

  9. #9
    RC Turnbuckle Jr.
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    xo1 spec diffs and lem o rings ftw!

  10. #10
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    Just did the seals and installed 50wt oil. Used P/N 5381 for the seals. The O-Rings mentioned above were out of stock. Are they really that much better than Traxxas?

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