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Thread: rear differential grinding

  1. #1
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    rear differential grinding

    I have a 2005 LJ with a Dana 44. I did a fluid change on it and drove to work today and there's a grinding noise coming from the rear end while turning. It has 141,000 miles on it. I do the fluid changes every 20,000 miles +/-. I did not put the friction modifier in because it is my understanding the limited slip fluid should not need it. Could this be the cause?

  2. #2
    Meme King WJCO's Avatar
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    Limited slip carriers definitely require the friction modifier additive.
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  3. #3
    Knows a Thing or Two Wethy's Avatar
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    I thought they only made rubicon LJs with air lockers.. do those still require the modifier? I could be wrong but arent they worm gears not clutches? And theoretically not need the LSD additive

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  4. #4
    Administrator wayoflife's Avatar
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    Quote Originally Posted by WJCO View Post
    Limited slip carriers definitely require the friction modifier additive.
    This ^^^^ Of course, pretty much all synth gear oil has it in it.

    Quote Originally Posted by Wethy View Post
    I thought they only made rubicon LJs with air lockers.. do those still require the modifier? I could be wrong but arent they worm gears not clutches? And theoretically not need the LSD additive
    Not all LJ's were Rubicons.

  5. #5
    Knows a Thing or Two Wethy's Avatar
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    Quote Originally Posted by wayoflife View Post



    Not all LJ's were Rubicons.


    Well thats neat. I did not know that. I learned something new today!

    Sent from my SM-G960W using WAYALIFE mobile app
    '14 JK Sport Anvil 6-Spd 3.73 gearing
    Installed:
    -Rubicon Express 2.5" lift with monotube shocks
    - Cobra Cb 18 WX STII
    - 285/70/17 Duratracs
    - 1.5" G2 Wheel Spacers
    - Rigid Dually Spots
    - Poison Spyder A-Pillar Mounts
    -RC 2.5" swaybar disco's


    Awaiting Install:
    -

  6. #6
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    Itís starting to make sense why I have the grinding this time and not previously. I usually use synthetic, but this go around I used traditional gear oil. I guess the non synthetic, even though itís LSD, does not include the modifier. Iíll add the friction modifier when I get home. I have a tube of it.

  7. #7
    Meme King WJCO's Avatar
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    Quote Originally Posted by Unlimited4x4 View Post
    It’s starting to make sense why I have the grinding this time and not previously. I usually use synthetic, but this go around I used traditional gear oil. I guess the non synthetic, even though it’s LSD, does not include the modifier. I’ll add the friction modifier when I get home. I have a tube of it.
    Hopefully there isn't damage already done to the clutches. Good luck.

    However, if the traditional oil SAID that the modifier was in it, it should be in there.
    Last edited by WJCO; 05-06-2019 at 04:07 PM.
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  8. #8
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    Quote Originally Posted by Unlimited4x4 View Post
    Itís starting to make sense why I have the grinding this time and not previously. I usually use synthetic, but this go around I used traditional gear oil. I guess the non synthetic, even though itís LSD, does not include the modifier. Iíll add the friction modifier when I get home. I have a tube of it.
    Iíll add that LSDís usually have some chipped teeth on the spider gears, at least on the ones weíve re-geared. Sometimes that shit gets out of hand and starts tearing things up. Next time you have it open take a good look at them.


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  9. #9
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    Looking at the teeth was one of the reasons I did this. No chips or chunks in the bottom of the casing and no observable damage to the teeth.

    Just took it around the parking lot for a while, lots of turns. No grinding. Didnít grind on the test drive yesterday either, but it was all local. The difference is I drove interstate for about 20 minutes this morning then some local. It was after the interstate driving I noticed the grinding while turning on the local side street

  10. #10
    Administrator wayoflife's Avatar
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    Quote Originally Posted by Unlimited4x4 View Post
    Looking at the teeth was one of the reasons I did this. No chips or chunks in the bottom of the casing and no observable damage to the teeth.

    Just took it around the parking lot for a while, lots of turns. No grinding. Didnít grind on the test drive yesterday either, but it was all local. The difference is I drove interstate for about 20 minutes this morning then some local. It was after the interstate driving I noticed the grinding while turning on the local side street
    Are you sure the sound is coming from your gears and not something like your u-joints?

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