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Slight Chatter Grumble After Diff Fluid Change

Discussion in 'General Tundra Discussion' started by Professional Hand Model, Sep 18, 2018.

  1. Sep 18, 2018 at 4:42 PM
    #1
    Professional Hand Model

    Professional Hand Model [OP] A.K.A ‘Golden Hands’

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    2002 Tundra 4WD (limited slip)

    Just replaced front and rear and transfer case gear oils with 75w-90 Mobil1 LS (for limited slip) using spec amounts/portions per manual.

    Noticing a very slight grumble/chatter that was not there prior to changing all three locations. Seems like its up front.

    Happens on turns and acceleration from 0-10 mph (infrequently and not every acceleration) and only on acceleration. Over 10mph no problems. Never on deceleration.

    Noticing it more when towing (still infrequently but more often than not when towing). Again acceleration 0-10mph. Over ten nothing.

    Questions:

    Am I to assume the new Mobil1 LS Gear Oil GL-5 did not have enough friction modifier?

    Do I add some pure friction modifier from a tube?

    If so, how much?

    To all three locations front, rear, and transfer case?
     
  2. Sep 18, 2018 at 6:33 PM
    #2
    ethan1911

    ethan1911 I’m one of those regular weird people

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    I’d start by adding friction modifier I don’t know how much to add in your case but I know that stuff makes a big difference in old posi units. If that doesn’t fix it I’d pull the 3rd member and inspect the carrier.
     
  3. Sep 18, 2018 at 6:52 PM
    #3
    Darkness

    Darkness Allergic to white

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    I remember dumping a whole tube in mine long ago but that was the rear diff and the tube was basically a "serving size", I believe it was Sta-Lube that I picked up from Toyota. Can't recall the size.

    Last change used a fluid from Lucas Racing and didn't need modifier.

    Side note, mine was rear diff not front. Cool guys run 2wd.
     
  4. Sep 18, 2018 at 7:59 PM
    #4
    Pudge

    Pudge Super Secret Elite Member #7

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    I had that issue with my 08 Tacoma sport with LSD. I added a 7oz tube of this stuff and it fixed the issue. Was recommended by chris4x4 over at tacomaworld
    Edit: I added about 4oz or half a tube.
    I also purposely stayed away from synthetic gear oil for that rear diff. Idk what I'll use in my tundra when the time comes

    Screenshot_20180918-225729_Chrome.jpg
     
    Last edited: Sep 19, 2018
    YardBird and (deleted member) like this.
  5. Sep 19, 2018 at 4:46 AM
    #5
    Professional Hand Model

    Professional Hand Model [OP] A.K.A ‘Golden Hands’

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    This is the stuff I bought yesterday! Its made by CRC. I’ve read reviews about it and even found one guy with an 02’ Tundra that had the same situation. He changed all his diff fluid with new Mobil1 75w-90 Synthetic LS. His truck had a slight grumble and was fixed by this.

    Also, read a few Taco guys saying the same thing.

    Trick is going to be finding out the proper amounts to install. One mechanic guy on the reviews said to only use the minimum amount to stop the chatter. Too much is not good (per instructions also). Said to add a little at a time till it is corrected.

    My suspicion is it only needs a little.

    I’ll be calling Toyota and CRC today to figure it out with them based on Mobil1 specs.

    Thanks again for the feedback everyone!
     
  6. Sep 19, 2018 at 4:53 AM
    #6
    Professional Hand Model

    Professional Hand Model [OP] A.K.A ‘Golden Hands’

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    This Lucas stuff may be what I go with next time or if this ‘modifier’ doesn’t work out. I read Toy guys saying thats the stuff to go with in some of these reviews. I think it only comes in 80w-90 though and Toy is spec’d at 75w-90 front and 90w in back diff (no longer available).

    My stealership uses Mobil1 and thats why I used it.
     
  7. Sep 19, 2018 at 5:00 AM
    #7
    ColoradoTJ

    ColoradoTJ Certified tow LEO Staff Member

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    I would start with about 3 oz of modifier.
     
  8. Sep 19, 2018 at 5:06 AM
    #8
    Professional Hand Model

    Professional Hand Model [OP] A.K.A ‘Golden Hands’

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    In front? This front diff holds 1.2 qts.

    Or, back? This back diff holds 3.1 qts.
     
  9. Sep 19, 2018 at 5:50 AM
    #9
    Pudge

    Pudge Super Secret Elite Member #7

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    I think I used a half a tube for rear diff and about an ounce in the front. I think I even have some left in my garage
     
  10. Sep 19, 2018 at 6:30 AM
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    ColoradoTJ

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    What Sean suggested.
     
  11. Sep 19, 2018 at 6:39 AM
    #11
    Pudge

    Pudge Super Secret Elite Member #7

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    I probably didn't need any in the front diff seeing I dont think it had any sort of limited slip. But it worked so well in the rear I figured I'd go for it, on a smaller scale though.
     
  12. Sep 19, 2018 at 10:55 AM
    #12
    Professional Hand Model

    Professional Hand Model [OP] A.K.A ‘Golden Hands’

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    Here is where I am right now. Spoke with ‘Toyota Care’ 800#. They ‘cannot recommend additives’ such as ‘friction modifier’. Only that the 75w-90 is the best to use.

    I have driven this morning and the infrequent grumble is even more infrequent compared to past few days.

    Bought some Lucas 80w-90 (mineral based for LS) and may do the rear diff with it. Or, add some friction mod to the Mobil1 in both diffs. Still sussing it out. Thanks for the inputs thus far.
     
  13. Sep 19, 2018 at 11:01 AM
    #13
    Professional Hand Model

    Professional Hand Model [OP] A.K.A ‘Golden Hands’

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    I just saw you edited your other comment and you said that you will stay away from the synthetic based oil in the rear diff. I’ve read this from some people. They used the Lucas 80w-90 (mineral based for LS). I’m thinking this may be the correct way to go.
     
    Pudge[QUOTED] likes this.
  14. Sep 19, 2018 at 11:04 AM
    #14
    Pudge

    Pudge Super Secret Elite Member #7

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    Yeah I went back and read my post from tacomaworld and saw that it was not recommended to use synthetic in the rear diff and I posted the oil and additive I used. It was all non synthetic
     
  15. Sep 19, 2018 at 4:44 PM
    #15
    Professional Hand Model

    Professional Hand Model [OP] A.K.A ‘Golden Hands’

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    Final update and mental notes after sussing it out:

    1) Prior to doing work called Stealership and they said use Mobil 1 75w-90LS for 3 changes. I used it. It was full synthetic. Is there a Mobil1 75w-90 gear oil non syn?

    2) Grumble problem (very slight) happens infrequently with Mobil1 Syn.

    3) Mass research done and seems there are two options
    A) Insert Slip Modifier (sounds cool and easy) $16 tube at auto store. Unsure how much to use.
    B) Change rear diff to Lucas 80w-90 Heavy Duty Gear Oil ( works with LS) $27 for 3 quarts.

    4) Call Toy Care 800# prior to command decision and girl listens to my story and then consults with someone. Toy does not recco additives in anything. They said to consult with local stealership about problem. Problem is I consulted them first (see #1) and this is why I’m having said problem. Girl is highly trained in being nice and ‘understanding my problem’. Me, on the otherhand, see the problem and want to fix it but can’t stand circular thought.

    5) Make command decision to install 3 quarts of Lucas 80w-90 in rear diff. Test drive and hear said grumble twice. Take 3 hour break and do another test drive. Problem cannot be replicated. Grumble gone. Will keep everyone posted as time goes on. Could have another problem? Can’t rule out randomness.

    Conclusion: Use Lucas 80w-90 Heavy Duty Gear Oil in rear diff. Dino oil is best or whatever they put into their formula works (so far). Or, a combo of both. Will be taking unused friction modifier tube back for refund. Wanted to solve the problem without adding a layer of another chemical. Note: I’ve kept the Mobil1 75w-90 Syn LS in the transfer case and front diff.

    Lesson: Sometimes you gotta work it out because nothing is cut and dry when dealing with old mechanicals. I just did a $39 flush with Syn Mobil1 in my rear diff and replaced it with Dino Lucas 80w-90 Heavy Duty. Still cheaper than paying someone to do it.
     
    AZBoatHauler and Pudge[QUOTED] like this.
  16. Sep 19, 2018 at 4:56 PM
    #16
    Pudge

    Pudge Super Secret Elite Member #7

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    I'm glad you got it worked out. I have a feeling the synthetic in the front diff and transfer case is just fine. Its just that the Toyota lsd is finicky when it comes to oil.

    I have some older lawn equipment and my 1985 Honda 250sx 3 wheeler and I will only run dino oil in those because that's what was aro around when they were made. The 1998 Kohler on the mower and the old trike still run great to this day.
     
  17. Sep 19, 2018 at 6:10 PM
    #17
    eiraved

    eiraved Plane Whisperer

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    Now that we got that ironed out, let's see your hands! :worthless:
     
  18. Dec 12, 2019 at 7:21 PM
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    Drock99

    Drock99 New Member

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    I have a 2006 DC that I just did a rear diff fluid change. Like everyone else I did a ton of research on what gear oil to use. I ended up going Lucas 80w90. I didnt add friction modifier initially but noticed a slight chatter when starting from a stop and turning the wheel at the same time. In other words not going straight from a stop. I got some of the friction modifier recommended here and put in 3 ounces. I still notice a slight noise but not as noticeable. Almost seems like the wheel in the direction I was turning slipped a slight bit. I guess my next step is to add one more ounce. Toyota said they use 80w90 with 4 ounces of some ford friction moodier (dealer told me this).
    anyone have experience with using Lucas and adding a modifier?
     
  19. Dec 13, 2019 at 4:59 AM
    #19
    Professional Hand Model

    Professional Hand Model [OP] A.K.A ‘Golden Hands’

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    Post #15 still stands.
     
  20. Dec 13, 2019 at 7:22 AM
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    FirstGenVol

    FirstGenVol Brake Czar

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    I also used Lucas without the modifier. No issues. I feel like that girl gave you some false info about Toyota never recommending the friction modifier. I bet if you called 5 times you'd get 5 different answers. Such is life anymore.
     
  21. Dec 13, 2019 at 9:25 AM
    #21
    Drock99

    Drock99 New Member

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    Straight Lucas didn’t work for me. Even Lucas told me I’d have to add friction modifier for LSDs despite using the 80w90 for LSDs. Go figure. I’ll add one more ounce and see where that puts me.
     
  22. Dec 13, 2019 at 9:27 AM
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    Drock99

    Drock99 New Member

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    My buddy works service at Toyota. He said they always add the modifier. Said their gear oil is some no name brand in a big drum.
    I just think I’m noticing something that the average person wouldn’t even care about.
     
  23. Dec 13, 2019 at 9:45 AM
    #23
    Drock99

    Drock99 New Member

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    This is what I used

    E994592F-4B11-44A0-B18B-B487BC59A394.jpg
     
  24. Dec 13, 2019 at 10:45 AM
    #24
    Professional Hand Model

    Professional Hand Model [OP] A.K.A ‘Golden Hands’

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    Toy will not recommend anything outside of their manual because of lawyers.

    Just like the other day the Toy rep on the phone said that a drain and fill of the transmission is 2.1 quarts (per manual book) when clearly we know better and our resident Toy mechanic says he does these all the time with 4-5 quarts.

    Drock. Maybe your diff needs Synthetic? Mobil1 didn’t work for me plus its available only in 75w-90.

    Pure 90w is impossible to find (spec’d for 2002)
     
  25. Dec 13, 2019 at 4:25 PM
    #25
    Tiamat

    Tiamat New Member

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    I’ve heard this happen with transmission, power steering , rear end , transfer box after fluid change. Always with non oem Toyota fluid. I get it, they are pricey and sometimes hard to find.the solution always seams to be to flush and replace with oem or add a special addictive.
    I just paid 30.00 for three qts on oem rear end fluid and 50.00 for 5 qts of transmission fluid. No issue after any change.
     
  26. Dec 13, 2019 at 4:35 PM
    #26
    Professional Hand Model

    Professional Hand Model [OP] A.K.A ‘Golden Hands’

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    Picture this riddle. I called the local stealership and asked what rear diff fluid they use for 2002 Toyota Tundra. They say Mobil 1 75w-90. I look (and already know) that the manual states straight 90w. Why does the dealer use non-OEM 75w-90 then?

    Another riddle: Why does our manual spec 2.1 quarts for a A340f transmission ‘drain and fill’ when we know from personal experience its at least 4-5 quarts? I called Toy Corp. the other day and asked them for clarification and they stuck by the wrong 2.1 quart amount.

    Triple verification was done with a Toy Stealer mechanic and says they ‘drain and fill’ 4-5 quarts.

    Glad your fluid works for your 3rd Gen.
     
  27. Dec 13, 2019 at 4:43 PM
    #27
    Professional Hand Model

    Professional Hand Model [OP] A.K.A ‘Golden Hands’

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  28. Dec 13, 2019 at 4:45 PM
    #28
    Tiamat

    Tiamat New Member

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    I do the services myself. Easy and with internet I can buy the oem stuff cheap. Im about to do the brake fluid and power steering.
     
  29. Dec 13, 2019 at 5:12 PM
    #29
    Professional Hand Model

    Professional Hand Model [OP] A.K.A ‘Golden Hands’

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    Same here with the DIY.

    My point is on my 2002 I’ve tried the ‘OEM dealer’ fluid (see above post #1) and ended up converting over to Lucas 80w-90 in the rear diff and it worked. Drock (2006 Tundra) is wondering why Lucas isn’t working for him. Maybe that extra ounce of modifier will help?
     
  30. Dec 13, 2019 at 5:55 PM
    #30
    Drock99

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    I wish I knew what oem was and I’d buy it. No Toyota brand 90w or 80w90. They money doesn’t matter to me. I’d rather get the right parts and fluid to do the job.
     

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