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Noisy trutrac differential

Discussion in 'VE Holden Commodore (2006 - 2013)' started by Robert Dawson, Mar 15, 2020.

  1. Robert Dawson

    Robert Dawson New Member

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    Hi, this is my first post. I have recently bought a 2009 VE SS. It has had a truetrac differential with 4:11 gears fitted in 2016. It is noisy especially at about 80kmh. Can anyone give me some advice as to what I can do. I am new to Commodores.
    Cheers,
    Robert
     
  2. mechanic

    mechanic Active Member

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    What type of noise?
    How do you know it’s the diff?
    Tyre or bearing noise can sound very similar.
     
  3. lmoengnr

    lmoengnr Well-Known Member

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    The (aftermarket) 4.11 ratio gear sets for the ZF diffs are known to be noisy.
     
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  4. Robert Dawson

    Robert Dawson New Member

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    It was diagnosed by my mechanic who knows modified commodores well. You can hear the noise all the time but louder at 80kmh. I did think of tyre noise at first.
    Thanks
     
  5. Robert Dawson

    Robert Dawson New Member

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    I heard someone suggest promar additive.
    Would different grade diff oil make any difference?
     
  6. mechanic

    mechanic Active Member

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    What type of noise?
    Gear noise is usually a whine that comes only at certain speeds.
    Bearing noise is there constantly.
    The two are treated differently.
     
  7. lmoengnr

    lmoengnr Well-Known Member

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    The 4.11 gearsets available for ZF diffs are inherently noisy...
     
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  8. immortality

    immortality No more smoky bacon :( Staff Member

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    If your mechanic is familiar with modified Commodores, what was his suggestion?

    If it is the gears than generally there isn't much you can do except maybe try a different oil.
     
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  9. 07GTS

    07GTS Well-Known Member

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    did u keep the factory diff rubbers or upgrade to more solid ? even with my standard diff 3.7 i changed mine to street semisolid and got a heap of noise so went back to factory and silent again
     
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  10. vr304

    vr304 Well-Known Member

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    If they used the motive brand diff gears they are noisy, got the diff rebuilt in my old vx ss with a true Trac and 3.9 gears new bearings etc and it was noisy right from the start due to the diff gears
     
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  11. lmoengnr

    lmoengnr Well-Known Member

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    Motive are the only suppliers of 4.11 ratio ring and pinion gears for ZF diffs.
     
  12. immortality

    immortality No more smoky bacon :( Staff Member

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    It's because most aftermarket diff gear sets are primarily made for motorsport use where noise isn't an issue.
     
  13. Robert Dawson

    Robert Dawson New Member

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    Thanks for your insights. I may just have to live with the noise.
     
  14. Robert Dawson

    Robert Dawson New Member

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    Not sure what diff rubbers were used.
     
  15. VTS5

    VTS5 TechJunkie

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    NO you don't have to...We do those conversions all the time,,and we ONLY use Motive Gears,ZF's gear setup , shimming and pinion setup is VERY important and tricky , not every1s cup of tea,specially so called mech's.we do their dirty work,including few dealers.
    Long story short.......
    You should have a very quiet and smooth running diff,regardless of the ratio.We mostly install 3.7 and 4.11
    We also have PLENTY ex GMH stock,LSD SINGLE
     
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  16. immortality

    immortality No more smoky bacon :( Staff Member

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    What backlash do you guys recommend?
     
  17. VTS5

    VTS5 TechJunkie

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    8 to 10 will give you nice quiet strong setup...Good quality full syn. oil is also very important..
    I must add,every different ratio requires different approach to pinion setup.Pinion shim thickness,crush sleeve length and condition,bearing type/brand etc.etc.
     
    Last edited: Mar 17, 2020
  18. immortality

    immortality No more smoky bacon :( Staff Member

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    I've mocked mine up with a solid pinion spacer, original pinion shim, dialed in .009 backlash and it gave a nice wear pattern. This is all on a M80, new bearings, 3.73 motive gears with Eaton trutrac centre. Now I need to finish stripping it all down, clean and fit seals and do the final reassembly.

    Interestingly, I'm sure the Eaton instructions said mineral oil?
     
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  19. villn808

    villn808 Active Member

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    Eaton and Harrop both recommend mineral? 80w90,

    Although I’m using Penrite 85w110 Pro Gear mineral.
     
  20. VTS5

    VTS5 TechJunkie

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    You can use whatever your heart desires..Olive oil if u want,it's your diff not mine,I wouldn't put mineral oil into our customers differential,
    Unless it's a single spinner B/W or full spool(smaller size carrier/s more space in the housing)
    It's no brainer,,syn. oil outlasts and outperforms min. oil.
    In simple terms;;
    In small housing,spinning thousand time a minute,churning gears creates lots of aeration and foam/air bubbles,straight into the meshing gears gets compressed(bang) creates heat and wear.
    Syn. oil will typically have a film strength 5 to 10 times higher then min. oil(less gear wear),
    Syn oil simply more tolerant to extreme heat then petroleum based oils are,
    Syn oil flow much much faster and better then mineral oil,therefore your expensive pinion bearings won't be starving for lubrication and your carrier bearings won't be dancing in their cups.
    Mineral oil requires more service (2 to 1)intervals,
    etc. etc. etc..

    OIL, .lubricates it..For quiet and strong performance, diff centre,should be setup properly first...
     
    Last edited: Mar 19, 2020
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