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  1. #1
    RC Competitor
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    Unhappy Diff Shredding Sound

    Iím not sure if Iím the only one having this same issue. But as Im driving, I hear shredding sounds coming from the truck all the time that I just hate. However, as Iíve disassembled it many times due to this same issue, both the front and rear diff gears are shred free. No nicks at all. Same with the centre diff and spur gear and pinion gear. All my gears appear to be perfectly fine. Both front and rear diffs filled with their proper oil, and all greased up, with the gears inside the diffs being in perfect health as well. Anyone know the cause?

  2. #2
    RC Champion
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    A video would help diagnose the issue
    fabricator

  3. #3
    Marshal Double G's Avatar
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    Honestly, you'll need to isolate the issue by determining if it happens when you push it by hand or not. Then try securing it to a stand with the tires off and methodically disconnecting moving parts...such as removing the axle shafts in front and rear and the center shaft and seeing if the problem stays or goes away. As soon as a part is disconnected and the sound disappears you've found your issue.

    Or the problem could simply be a stick or other foreign object stuck some place.
    The Super Derecho

  4. #4
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    Quote Originally Posted by Double G View Post
    Honestly, you'll need to isolate the issue by determining if it happens when you push it by hand or not. Then try securing it to a stand with the tires off and methodically disconnecting moving parts...such as removing the axle shafts in front and rear and the center shaft and seeing if the problem stays or goes away. As soon as a part is disconnected and the sound disappears you've found your issue.

    Or the problem could simply be a stick or other foreign object stuck some place.
    Agree with this, is the best method.

  5. #5
    RC Champion grizzly03's Avatar
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    Quote Originally Posted by XmaxxBasher1200 View Post
    I’m not sure if I’m the only one having this same issue. But as Im driving, I hear shredding sounds coming from the truck all the time that I just hate. However, as I’ve disassembled it many times due to this same issue, both the front and rear diff gears are shred free. No nicks at all. Same with the centre diff and spur gear and pinion gear. All my gears appear to be perfectly fine. Both front and rear diffs filled with their proper oil, and all greased up, with the gears inside the diffs being in perfect health as well. Anyone know the cause?
    Did you set your gear mesh manually or change gears? You could have them too tight.

  6. #6
    RC Qualifier Flux Capacitor's Avatar
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    Quote Originally Posted by XmaxxBasher1200 View Post
    I’m not sure if I’m the only one having this same issue. But as Im driving, I hear shredding sounds coming from the truck all the time that I just hate. However, as I’ve disassembled it many times due to this same issue, both the front and rear diff gears are shred free. No nicks at all. Same with the centre diff and spur gear and pinion gear. All my gears appear to be perfectly fine. Both front and rear diffs filled with their proper oil, and all greased up, with the gears inside the diffs being in perfect health as well. Anyone know the cause?
    The X-Maxx by nature has a noisy drive-train and I had isolated about 70% of it coming from within the differential housings. The ring gears mating with the center axle pinions was causing a lot of ruckus on mine until I swapped out or quit using grease in the housing itself. Unless you fill the housings to the max with grease, you can expect a lot of chatter coming from within the housing holding the ring gear and pinion.

    I got tired of cleaning the grease off of the housing and lower bulks and was frustrated that every time I packed them with grease, it was just sticking to everything but the ring gear and pinion that it was suppose to quite down.

    So here is what I did. I made a quick access lubrication point and used a 2.0mm size screw that is about 2.5mm long. A short screw in other words so it wouldn't hit the ring gear inside the housing. I bought some Specialist WD-40 (not cheap) and about every three runs, I remove the quick access screw and give it a burst of fresh gel based WD-40 in both the front and rear differential housings.
















    The shredding sounds have but all subsided to an acceptable level compared to when I first drove it.

    About 30% of your other clicks, clacks and chatters come from the motor pinion to spur Cush drive assembly/torque biasing center drive combination and can be tamed down in the noise department with a drop of oil sparingly here and there.
    Last edited by Flux Capacitor; 08-27-2020 at 02:05 AM. Reason: Spelling.
    Sent from my autonomous device.

  7. #7
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    Quote Originally Posted by Flux Capacitor View Post
    The X-Maxx by nature has a noisy drive-train and I had isolated about 70% of it coming from within the differential housings. The ring gears mating with the center axle pinions was causing a lot of ruckus on mine until I swapped out or quit using grease in the housing itself. Unless you fill the housings to the max with grease, you can expect a lot of chatter coming from within the housing holding the ring gear and pinion.

    I got tired of cleaning the grease off of the housing and lower bulks and was frustrated that every time I packed them with grease, it was just sticking to everything but the ring gear and pinion that it was suppose to quite down.

    So here is what I did. I made a quick access lubrication point and used a 2.0mm size screw that is about 2.5mm long. A short screw in other words so it wouldn't hit the ring gear inside the housing. I bought some Specialist WD-40 (not cheap) and about every three runs, I remove the quick access screw and give it a burst of fresh gel based WD-40 in both the front and rear differential housings.
















    The shredding sounds have but all subsided to an acceptable level compared to when I first drove it.

    About 30% of your other clicks, clacks and chatters come from the motor pinion to spur Cush drive assembly/torque biasing center drive combination and can be tamed down in the noise department with a drop of oil sparingly here and there.
    Interesting product, my friend.

  8. #8
    RC Qualifier Flux Capacitor's Avatar
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    Quote Originally Posted by Juanmacine View Post
    Interesting product, my friend.
    Yeah, I figure at almost $10 bucks a can, that stuff better have breakfast ready for me in the morning and tuck me in at night!

    Overall, I am impressed with the fact that it calmed the chatters down in the drive-train better than grease. Because it is gel-based, I believe it outperforms grease in the adhesion department and doesn't squeeze out as easily as grease when the ring gear and pinion mesh.

    Like I mentioned, when I would disassemble the differential housings from the bulks, the grease was everywhere other than where it was suppose to be and took tedious time to remove the excess grease just to do routine maintenance. Now, when I disassemble them, it takes about 30 seconds to clean them out and about five seconds to reapply a burst of the 12x formula.

    The problem with grease in the housings, is that you never know if a stray contaminate of foreign material made it into the assembly process and with my method, it is sealed up dry and clean and then lubed with the lowest possible risk of foreign matter making it into the housing.

    I actually soak the ring gear in regular WD-40 (bought a gallon can of that as well) before assembly so as to not have little stray metal shards from the normal process of friction between the ring gear and pinion. Every metal to metal piece gets a bath before assembly and blown off with compressed air so as to eliminate any possibility of foreign contamination.

    With grease, that is just a 50/50 chance you take that your supply is clean and no stray contaminants are present while assembling. My way seals up the box first and then adds the lubricant.

    It is a matter of preference; although I do tend to go with what works and try to share to the best of my ability things that can save time. And the bottom line with this idea, is that not only is it easier and saves time; but it actually works better. Sure the lubricant eventually leaks out and causes the unsightly build-up around the outside of the housing; but it is a snap to clean up versus trying to get contaminated grease out of the housing and lower bulk crevices for ten minutes or so.
    Last edited by Flux Capacitor; 08-28-2020 at 02:07 PM. Reason: Revision.
    Sent from my autonomous device.

  9. #9
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    Quote Originally Posted by Flux Capacitor View Post
    Yeah, I figure at almost $10 bucks a can, that stuff better have breakfast ready for me in the morning and tuck me in at night!

    Overall, I am impressed with the fact that it calmed the chatters down in the drive-train better than grease. Because it is gel-based, I believe it outperforms grease in the adhesion department and doesn't squeeze out as easily as grease when the ring gear and pinion mesh.

    Like I mentioned, when I would disassemble the differential housings from the bulks, the grease was everywhere other than where it was suppose to be and took tedious time to remove the excess grease just to do routine maintenance. Now, when I disassemble them, it takes about 30 seconds to clean them out and about five seconds to reapply a burst of the 12x formula.

    The problem with grease in the housings, is that you never know if a stray contaminate of foreign material made it into the assembly process and with my method, it is sealed up dry and clean and then lubed with the lowest possible risk of foreign matter making it into the housing.

    I actually soak the ring gear in regular WD-40 (bought a gallon can of that as well) before assembly so as to not have little stray metal shards from the normal process of friction between the ring gear and pinion. Every metal to metal piece gets a bath before assembly and blown off with compressed air so as to eliminate any possibility of foreign contamination.

    With grease, that is just a 50/50 chance you take that your supply is clean and no stray contaminants are present while assembling. My way seals up the box first and then adds the lubricant.

    It is a matter of preference; although I do tend to go with what works and try to share to the best of my ability things that can save time. And the bottom line with this idea, is that not only is it easier and saves time; but it actually works better. Sure the lubricant eventually leaks out and causes the unsightly build-up around the outside of the housing; but it is a snap to clean up versus trying to get contaminated grease out of the housing and lower bulk crevices for ten minutes or so.
    Thanks for your tips, mate, maybe I try to buy this product, looks very well. I use a high quality Molibdenum grease in my gears and diffs housings, at this moment, it works perfect, less noise, smooth movement, no wear sings.

  10. #10
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    Very interesting solution. Thanks for sharing.

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