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Lube on external diff gears?

Discussion in 'Chassis & Drivetrain' started by Blxer, Jun 20, 2015.

  1. Blxer

    Blxer Well-Known Member

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    Hey, y'all!
    We all know how much of a pain it is to remove the transmission housing from our vehicles. So with that in mind, how often is it necessary to grease the outside of the diff and surrounding gears?
    Thanks in advance....
     
  2. Darren Wes

    Darren Wes Well-Known Member

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    Good question! I have heard a lot of people who bash regularly changing shock oil every 2~4 months and replacing every 6~10 months would be a transmission rebuild.

    I have heard that white lithium grease is good for the outside gears and transmission gears... personally if i were to grease the spur and pinion i would only use a small amount of lithium tho and nothing else.
    The transmission gears i have heard a mix of lithium grease and dabs of black grease help the gears.

    Then the diff. I'm pretty sure you shouldn't substitute diff oil. I asked my lhs guy if i should use marine grease like i do in my 18t he laughed. He said it would be an open diff if i did that. It would be a lack of resistance from the diff if i use any kind of grease instead of the oil because somehow the liquid diff fluid has more resistance than the sticky solid marine grease. ? :/

    Anyway. White lithium grease is what your looking for. But im sure there are different products as well
     
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  3. Blxer

    Blxer Well-Known Member

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    Thanks, @Darren Wes.
    I have some green, Lucas oil grease. I used it when I filled my diff with diff oil. Was just hoping I didn't need to tear into the trans, more than once a month! :)
     
  4. WoodiE

    WoodiE Kind of good admin
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    While lithium grease is what I typically use as well.
     
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  5. ark1t3kt

    ark1t3kt Well-Known Member

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    I've been in this hobby for about a 1 1/2 years now, and what I've learned is that there is not one standard answer, but a lot of good "rules of thumb". When winter hits, that is when I will take my RC's apart and re-grease everything and replace any worn out parts (mostly bearings). So may answer is once a year, or sooner if something breaks and you have to get to it anyway.
     
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  6. Unusual RC

    Unusual RC Moderator
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    As long as the gearbox has no leaks, you do not have to grease those gears at all for at least a whole season!
     
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  7. slothkigg

    slothkigg Well-Known Member

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    are you talking about just the diff? or the diff cups on either end or the dogbone? also i have never oiled or done anything to the spur gear area as far as lube goes. should i be? i figure if i lube it that the dust/gravel and whatnot will stick to it because its exposed just making a gritty mess.
     
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  8. ark1t3kt

    ark1t3kt Well-Known Member

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    You can lube your diff cups/dogbones with a dry wax lube such as trakpower krytech. It lubricates but does not attract dust. It's also used on bicycle chains.

    I don't lube the spur/pinion. I don't think it needs it, but I guess you could use the dry wax lubricant as well. Just don't get it on the slipper pad.

    Inside the diff you should use silicone diff fluid. I use team associated brand.

    On the exterior of the diff and on the transmission gears I use white lithium grease. Can be found at home depot.

    Hope this helps.
     
  9. Unusual RC

    Unusual RC Moderator
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    Never heard of that dry wax stuff.
    Sounds interesting.
    Let's see if this is available on this side of the pond!
     
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  10. slothkigg

    slothkigg Well-Known Member

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    I've heard or dry wax for my quadcoptors. I'll have to give it a try. Thanks!
     
  11. poombah

    poombah Well-Known Member

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    When they replaced my diff (twice) under warranty they have filled it with molybendium (sp?) black grease. I spoke with Arrma distributor and they said it's about the same as running a really high viscosity silicone oil just means the diff will virtually be a locker. I used same grease on the transmission gears and use the white ceramic grease everywhere else.

    I use Tamiya greases as that's what I have for my other cars. Used to use castrol hb grease on dogbone ends and cups in my tamiyas but probably attract too much dirt on an off-roader
     
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  12. CL-Audio

    CL-Audio Well-Known Member

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    Hey there. What exactly do you lube on the exterior of the diff. I pulled out my front diff from my Kraton and it and the gearbox housing was covering in grease. I filled the diff with 30K silicone fluid. Before I put it back in the housing do I smear grease all over the exterior of the diff, spur and housing and stick back in??
    Thanks
     
  13. OrangeDRAGON

    OrangeDRAGON Well-Known Member

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    I got in the habit of every time I take the cover off a differential (NOT open up the diff itself) I inspect the grease to ensure A) it's not dry (which means I am leaking) or B) the grease isn't full of dirt (which means a hole is letting too much dirt in) - and then I ALWAYS add a dab of lithium grease - https://www.amazon.com/Permatex-80345-White-Lithium-Grease/dp/B000HBNV58
     
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