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  1. #1
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    Ring and pinion question

    Is the ring and pinion a common item to break in the emaxx brushless ? I broke mine today and not looking forward to replacing it

  2. #2
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    its not too common, what is your pinion/spur gearing and what batteries are you using?
    EMBE
    Jato 3.3
    T-Maxx 2.5

  3. #3
    RC Turnbuckle Jr.
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    I broke mine twice. Really needs some aluminum cups but can't spend the hundred plus for them right now!
    Shimming will help but a loose slipper will help more

  4. #4
    RC Turnbuckle Jr. mike-susieq1's Avatar
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    loosen the slipper a little more perhaps, reduce take offs like no full throttle take offs, no jumping or cartwheels those will cause a stripped or even a broken diff.
    DEU 8:18 ESV

  5. #5
    RC Turnbuckle Jr.
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    In other words drive it.like a granny

  6. #6
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    both stock diffs on mine went after about 10 runs mostly 4s a couple 6s. both times it was the little bearing that failed. I rebuilt them with alum. cups and cases and avid bearings. Only run it a couple of times since so time will tell.
    Last edited by EMAXXBRUSHLESS; 01-10-2013 at 05:59 AM.

  7. #7
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    Quote Originally Posted by davyjones'_fleet View Post
    its not too common, what is your pinion/spur gearing and what batteries are you using?
    i am using 6s batteries (i know its a lot of power, but i love it) 24/68 is the gearing i am running. i thought putting a 24 pinion would help cause of less torque but i guess i was wrong. the truck wheelies like crazy so i think i am going to loosen the slipper a bit after i rebuild it. the funny thing is i have been running the truck for about 6 months with hpi phaltline tires which are street tires and should have more traction but yesterday when i put the stock tires back on they were a ton more grippy and would do back flip wheelies and in just 3 runs it broke, so im pretty sure thats why my ring and pinion broke.

  8. #8
    RC Turnbuckle Jr. mike-susieq1's Avatar
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    Quote Originally Posted by 50togo View Post
    In other words drive it.like a granny
    LOL that is funny. What I was trying to say was just take it a little easy to prevent having to replace diffs every time you take it out. I drive mine a little harder lately but watch out it doesn't cartwheel and hit something real hard.
    DEU 8:18 ESV

  9. #9
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    My 2c. Am running 6s, my truck takes a fair bit of abuse, still have stock diffs, diff cases etc. Only thing I did to my diffs was shim them properly. With properly shimmed diffs, unless you really really go crazy your diffs should hold up well.
    Always get a 2nd Opinion!

  10. #10
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    Quote Originally Posted by Mugs View Post
    My 2c. Am running 6s, my truck takes a fair bit of abuse, still have stock diffs, diff cases etc. Only thing I did to my diffs was shim them properly. With properly shimmed diffs, unless you really really go crazy your diffs should hold up well.
    What do you mean by shim them properly?

  11. #11
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    Basically you pull the Diff apart and add some shims where required. NOTE: Not every Diff will be the same, it is a trial and error approach until there is no "binding" when you turn any of the Diff shafts. Check this out as it shows you the basics. Although this is for a Losi Diff, the principles are the same. MITCH316 ERBE rebuild
    Last edited by Mugs; 01-10-2013 at 03:36 PM.
    Always get a 2nd Opinion!

  12. #12
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    After I shimmed my standard diffs, I never had a problem with them. I heard a clicking sound and figured it was the front diff (the original diff I blew before realising I should have shimmed them), pulled it apart and it was like new. Not a problem at all. So the diffs can definitely handle a decent load as I always run 6S, but they have to be shimmed or you'll just snap teeth off them constantly.

    The clicking sound I was hearing was teeth missing from the servos

  13. #13
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    im still a little confused on the shimming process. where do you get the shims? are they just metal washers? do you use the shims so there is less slack in the diff? what holds the shims in place, the driveshafts? sorry for my ignorance but i will be taking my rear end apart this weekend and installing a new diff want to do it right

  14. #14
    RC Turnbuckle Jr. mike-susieq1's Avatar
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    The shims come in different thicknesses and what is going to hold the diff is the case and the diff inside. The purpose of the shim is so there is no excess movement from the diff inside the case when this happens the diff gets too far away from the pinion gear inside and the diff since its connected to the drive shafts keeps spinning while the pinion is not moving causing when the gears contact to miss and grind down teeth on either or break off. You can buy The shims at towerhobbies. Amainhobbies, rcplanet or the lhs. Not sure though on part #
    DEU 8:18 ESV

  15. #15
    RC Turnbuckle Jr.
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    Here are the pinion shims http://www.ebay.com/itm/150827008558...84.m1438.l2649 and if you need to shim the ring gear associated21141. Same as the merv
    On my e maxx all I need was a pinion shim
    Here is the exploded view. You place a shim on the ring gear side between the ring gear and the bearing. Assemble the case and turn the pinion. It should be fairly smooth. Mine didn't need one. Keep adding shims until its too tight then take one out
    Then place a shim on the pinion between the pinion and the inside bearing. Do the same as the ring gear.
    Sometimes the pinion has too much clearance and with too many shims brings the pinion in too much and the pin for the driveshafts wont line up. Remove a shim until you can get the pin in

    Easy to do just take your time http://traxxas.com/explodedviews/390...HzDocking-Base
    Last edited by 50togo; 01-11-2013 at 01:02 PM.

  16. #16
    RC Turnbuckle Jr. Wildman4910's Avatar
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    An oldie but still good info, you will need the correct shims for your truck as the diffs are different then in the tread below but the way you shim them is the same.
    http://traxxas.com/forums/showthread...-Diff-Shim-Mod

    You will need 6mm, 8mm, 10mm shims.
    6mm
    http://www.amainhobbies.com/product_...6x8mm-Shim-Set
    8mm
    http://www.amainhobbies.com/product_...mm-Shim-Set-10
    10mm
    http://www.amainhobbies.com/product_...el-Shim-Kit-30
    http://www.amainhobbies.com/product_...mm-shim-kit-10
    Look out for the tree/crunch!

    LiPo? Naw NITRO!!

  17. #17
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    Awesome info guys. Thanks

  18. #18
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    Quote Originally Posted by Wildman4910 View Post
    An oldie but still good info, you will need the correct shims for your truck as the diffs are different then in the tread below but the way you shim them is the same.
    http://traxxas.com/forums/showthread...-Diff-Shim-Mod

    You will need 6mm, 8mm, 10mm shims.
    6mm
    http://www.amainhobbies.com/product_...6x8mm-Shim-Set
    8mm
    http://www.amainhobbies.com/product_...mm-Shim-Set-10
    10mm
    http://www.amainhobbies.com/product_...el-Shim-Kit-30
    http://www.amainhobbies.com/product_...mm-shim-kit-10
    Well I installed another rear diff and did not shim it and it blew of course so I am going to try the shim thing but I had one question before I buy all the shims. You linked me to 2 different 10mm shims do I need to purchase both of them? I understand I need the 6mm and the 8mm but what 10mm do I need thanks for all the help

  19. #19
    RC Turnbuckle Jr. Wildman4910's Avatar
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    You only need one of them, either will work.

    If I remember right one of them was not in stock when I posted it, the Yokomo kit has 3 different size shims in it the Ofna only has one size.
    Look out for the tree/crunch!

    LiPo? Naw NITRO!!

  20. #20
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    So I could just get one yokomo kit? When you say the yokomo has three different sizes you mean 3 different thicknesses of 10mm. Not 6mm,8mm, and 10mm right
    Last edited by paulfromtulsa; 01-28-2013 at 10:44 PM.

  21. #21
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    Are you just replacing the ring &pinion. Aluminum cup and case would be a good upgrade and I would reshim it after the first few rides after they break in a bit

  22. #22
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    Great thread here. I was just thinking about how to shim. Perfect info guys

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