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Changed Rear Diff Fluid. Is this normal?

Discussion in 'General Tundra Discussion' started by WFD473, Aug 1, 2020.

  1. Aug 1, 2020 at 8:18 AM
    #1
    WFD473

    WFD473 [OP] Polished TRD

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    This is what I found stuck to the magnetic plug with around 55k miles. As far as I know, it was the original fluid.20200731_154019.jpg
     
  2. Aug 1, 2020 at 8:23 AM
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    Seafury

    Seafury Kickin names, and takin ass!

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    That's never good.

    Hopefully it was just casting flash, aka extra metal hanging on barely attached. Hard to say really without inspecting actual gear teeth in the dif.
     
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  3. Aug 1, 2020 at 8:29 AM
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    BTBAKER

    BTBAKER ..........

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    Those are decent size chunks. I would be mildly concerned. Hopefully someone who knows more than me will come by and put your mind at ease.
     
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  4. Aug 1, 2020 at 8:33 AM
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    NewImprovedRon

    NewImprovedRon Hey! Get off my grass!

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    I would be concerned finding two large pieces of metal like those and would check further but that is just me. I found the following reference via Google...

    Guidelines Fine Metal Particles The metal fines (sometimes called gear fuzz) adhering to the magnetic fill/drain plug are normal. It is normal for internal components to shed metal fines as the gears rotate. There may be a higher rate of metal fine shedding during the break in period. There are several types of larger particles that may be encountered on the drain/fill plug. These are thrust washer fragments, metal shavings, bearing fragments or gear tooth fragments. Thrust washer fragments Losing a part of a thrust washer does not necessarily adversely affect the operation of the axle and may not require disassembly, inspection or replacement of the axle. If the fragments are excessive or there is a concern that there is additional component damage, analyze the oil for iron content. If the iron is above 1000 ppm, inspect and repair as necessary. Metal shavings Occasionally one sees metal shavings from the machining of the housing. These shavings do not adversely affect the operation of the axle. It is not necessary to perform further inspections or remove the carrier for cleaning. If they persist through multiple inspections, it would be worth inspecting. Bearing or Gear tooth fragments Finding bearing or gear tooth fragments on the magnetic drain and fill plugs is a serious issue. Continuing to run in this condition can lead to further component damage.
     
    Last edited: Aug 1, 2020
  5. Aug 1, 2020 at 9:04 AM
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    slongo

    slongo New Member

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    As an ex mechanic I can say that its pretty normal to find a few shavings in the Diff fluid especially if its the first fluid change . I wouldn't be concerned and if you want to put your mind at ease drive it 5 thousand miles and drain it again and see if there is anything
     
  6. Aug 1, 2020 at 9:44 AM
    #6
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    I remember, about 2 years ago, another member posted a similar pic of their findings. Looked almost identical to your pic. There is a reason for the magnet and its done its job catching factory filings.

    Situation Normal (unless your truck is acting strange).
     
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  7. Aug 1, 2020 at 1:56 PM
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    WFD473

    WFD473 [OP] Polished TRD

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    Thanks to all! So far it's been acting normally from what I can tell. I remember reading that it's normal for the plug to collect filings from the factory, but I want sure if that looked excessive. I replaced the fluid with Amsoil severe gear 75W90 and will check it in 5k to see how it looks.

    Speaking of which, shout out to @lewi3069 for the Amsoil hookup!! Great guy to deal with and highly recommended.
     
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  8. Aug 1, 2020 at 4:09 PM
    #8
    landphil

    landphil Socially distant and prone to wandering.

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    As said, that looks like left-over shavings from when the axle housing was drilled / machined. Not completely uncommon on a first change, a bit startling, but no big deal.
     
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  9. Aug 1, 2020 at 6:31 PM
    #9
    lewi3069

    lewi3069 New Member

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    Glad I could help you out!
     
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  10. Aug 3, 2020 at 5:42 PM
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    Bucktail

    Bucktail New Member

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    Hmmm, Doesn’t look normal to me. They don’t look like gear teeth though. Change the fluid and run it a bit. Drain again and check.
     

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