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  1. #1
    RC Racer
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    Rear diff teeth stripped

    Heard some grinding in the rear under high traction situations. I took the rear off and some gears are missing pieces.

    Traxxas 6879.
    I read the x01 diffs are an upgrade? Should I go ahead and upgrade the rear diff since my 2200kv with 4s is on the way?


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  2. #2
    RC Champion FnFancy's Avatar
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    Yes sir! Since you're in there already might as well get her ready for that monster system.

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    Its alright son I'll fix it when you break it

  3. #3
    RC Qualifier Trentbaby65's Avatar
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    ^^^ What he said.

  4. #4
    RC Turnbuckle Jr. El Sob's Avatar
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    A good rule of thumb is to upgrade the part that heat destroyed. That way you can make your truck stronger and more reliable.
    Member of the 10,000 + posts club! Here to help!

  5. #5
    RC Racer
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    Quote Originally Posted by FnFancy View Post
    Yes sir! Since you're in there already might as well get her ready for that monster system.

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    I have mip front and rear cv shafts. Are these going to fit with the xo1 diff? I read they didnt

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  6. #6
    RC Champion FnFancy's Avatar
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    Quote Originally Posted by jake414 View Post
    I have mip front and rear cv shafts. Are these going to fit with the xo1 diff? I read they didnt

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    You basically build a hybrid. Add the side supports and the I beam inside your diff. Helps make it more ridged so it won't flex as much. There's also a thread on building a bulletproof slash diff for mip users.
    Its alright son I'll fix it when you break it

  7. #7
    RC Racer
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    So instead of buying the whole unit, I just replace parts out of mine?

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  8. #8
    RC Turnbuckle Jr. El Sob's Avatar
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    No! You need either the whole XO-1 differential or buy all of the parts and build one. If you try and put parts from the XO-1 differential into the stock differential it won't be strong. The center I bar and the side plates work together to make a strong differential. If you don't have both of the aforementioned parts the differential cup will oval and destroy itself. Been there, tried that.

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  9. #9
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    Quote Originally Posted by El Sob View Post
    No! You need either the whole XO-1 differential or buy all of the parts and build one. If you try and put parts from the XO-1 differential into the stock differential it won't be strong. The center I bar and the side plates work together to make a strong differential. If you don't have both of the aforementioned parts the differential cup will oval and destroy itself. Been there, tried that.

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    Actually, I'm not sure I have the mip shafts. I definitely have some sort of metal ones. They have the metal output with the dog bone that goes into it.

    I will post a pic when I get home.

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    Last edited by jake414; 11-06-2018 at 08:32 AM.

  10. #10
    RC Turnbuckle Jr. El Sob's Avatar
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    The differential being correct is a must. CV axles are also an important factor. You build it right and you will have a strong reliable truck.
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  11. #11
    RC Racer
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    This is what I have. Will stock xo1 diff work with these?

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  12. #12
    RC Turnbuckle Jr. El Sob's Avatar
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    It will! Anything that the stock differential will work with, the Xo-1 differential will also work with it also
    Member of the 10,000 + posts club! Here to help!

  13. #13
    RC Racer
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    Quote Originally Posted by El Sob View Post
    It will! Anything that the stock differential will work with, the Xo-1 differential will also work with it also
    Sweet. Sounds like I need to find a stock diff for sale.

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  14. #14
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    We did the same thing to our diffs on the first builds of savage, yes it is a 1/8 nitro rig but it made the diffs almost bullit proof..1 tip is if you’re just basher an a smasher fill the rear diff cup full of Sil-glide grease and the front about half..Good luck!!

  15. #15
    RC Turnbuckle Jr. Squeegie's Avatar
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    Quote Originally Posted by jake414 View Post
    Sweet. Sounds like I need to find a stock diff for sale.

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    Here you go (only 1 left right now):
    https://jennysrc.com/collections/tra...-front-or-rear

    Jenny runs out of stock often, but also gets them back in often. If sold out, just keep checking and they will be in stock again soon.

    Just note that the part you get from Jenny is not marked "front" or "rear." Once you get it, you should open it up and rebuild it with the diff fluid weight of your choice.

    Have fun!
    Creativity is intelligence having fun. -Einstein

  16. #16
    RC Champion Dcuda69's Avatar
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    I built my own. Add the diff oil of your choice. Easy peasy!
    6882x gear set
    3978 diff cup
    3236 screws(optional)
    Slash 4x4 Ult 2150kv
    Rustler vxl
    Ford GT vxl

  17. #17
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    Ordered it!! I want a little thicker than stock diff fluid. What is stock?

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  18. #18
    RC Turnbuckle Jr. Squeegie's Avatar
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    Stock X0-1 has 100,000W SAE in the front and 50,000W SAE in the back.
    Last edited by Squeegie; 11-06-2018 at 08:07 PM.
    Creativity is intelligence having fun. -Einstein

  19. #19
    RC Racer
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    Quote Originally Posted by Squeegie View Post
    Stock X0-1 has 100,000W SAE in the front and 50,000W SAE in the back.
    Or. What's stock in the slash 4x4 diff lol


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  20. #20
    RC Turnbuckle Jr. Squeegie's Avatar
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    Stock Slash 4x4 Ultimate has 30,000W in front and grease in the back.
    Creativity is intelligence having fun. -Einstein

  21. #21
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    Quote Originally Posted by Squeegie View Post
    Stock Slash 4x4 Ultimate has 30,000W in front and grease in the back.
    so if it want it a bit more locked than stock, what should i go with?

    also, do i need to buy the other gear seperate? This came with just the diff gear. I need the other one that comes from the center drive shaft right?

  22. #22
    RC Turnbuckle Jr. El Sob's Avatar
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    I used to use 100,000 in my rear differential. It made a difference in the performance of the truck. You will have more positive traction without sacrificing too much on tight corners.
    Squeegie, I know you are the all knowing on the forum. I thought the differential in the rear of the XO-1 had 10,000 weight. 50,000 is good to know.
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  23. #23
    RC Qualifier IanRose's Avatar
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    Quote Originally Posted by Squeegie View Post
    Stock Slash 4x4 Ultimate has 30,000W in front and grease in the back.
    This has me curious. I didnt know that, how heavy is this "grease"? Im looking at different high heat stuff that might
    Work good in diff. I coulld use propper diff fluid but im hoping to make some sort of discovery. Im about to try lucas stop slip atf. Figure if it can handle the heat of an old car, should work in a slash? Lol.
    ------
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  24. #24
    RC Turnbuckle Jr. Squeegie's Avatar
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    Quote Originally Posted by El Sob View Post
    I used to use 100,000 in my rear differential. It made a difference in the performance of the truck. You will have more positive traction without sacrificing too much on tight corners.
    Squeegie, I know you are the all knowing on the forum. I thought the differential in the rear of the XO-1 had 10,000 weight. 50,000 is good to know.
    Oops! You are 100% correct. The X0-1 rear diff is 10,000W.

    From page 26 of the X0-1 manual:
    From the factory, the front differential is filled with SAE 100,000W
    viscosity silicone oil. The rear differential is filled with SAE 10,000W.

    https://traxxas.com/sites/default/fi...O-1-Owners.pdf

    Must not have been paying attention when typing... I hate typing on my phone!

    Thank you for catching that El Sob!
    Creativity is intelligence having fun. -Einstein

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