Differentials and Transfer Case Fluid Change

Discussion in 'Maintenance - Break-in / Oil & Fluids / Servicing' started by Andy, Apr 15, 2019.

  1. Andy

    Andy Well-Known Member

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    Changed oil in both front and rear differentials and transfer case at 1000 miles.

    All three as expected had normal levels of metal collected on the drain magnet as well as some metallic shimmer to the oil itself.

    Replaced differential oil with 75w-90 Amsoil gear oil.

    Replaced transfer case fluid with Amsoil transmission fluid compatible with Mercon LV fluid. Factory fill was 7oz lower than required fill level.

    8C98B5D8-8FC4-495B-ADFB-B71C6128DAE8.jpeg
     
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  2. mstealth22

    mstealth22 Active Member

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    I did all mine today as well @ 1200 miles.

    I agree the magnets were full.

    IMG_20190504_141449.jpg
    Rear Diff - that is chunks and fine particals soaked in oil standing upright on top of the magnet. Drained oil was pretty dirty and some shiny stuff.IMG_20190504_160151.jpg
    Front Diff - wasn't too bad. Oil was still pretty clean.
    IMG_20190504_153121.jpg

    I didn't take a picture of the transfer case, it wasn't terrible, but the fluid was pretty dirty.

    Wasn't a terrible job other than no drain pan I have will stretch between engine oil and oil filter drip locations. Had to get a small pan for filter ramp drain. Now that I know, should be easy. Filter was simple, no tire turn, removed by hand, just took top, forward 3 plastic screws off, and flap out of the way.

    I think the capacity on the rear diff is spot on.
    Front Diff took less than 1 qt, manual calls for 1 qt and 1.76 oz. or 33.76 oz. Didn't fit.
    Transfer case / PTU or whatever Ford calls it, took more than the 23.7 oz, but I couldn't tell how much more, I think about exactly a quart give or take an ounce. I felt fluid near fill plug before draining, so I don't think it's partial fill scenario - maybe.
    Screenshot_20190504-224641.png
     
  3. Engmus

    Engmus Member

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    Bumping this. I am looking to do the same.

    Does anyone have the fluid requirements ? IE , not capacities but fluid specifications.

    Gl4, gl5, 75w90, etc?

    Much appreciated.

    Inb4 read the owners manual.
     
  4. fusseli

    fusseli Well-Known Member

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    I don't understand at all why this is necessary, aside from a fluid "upgrade"
     
  5. Engmus

    Engmus Member

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    As someone who has run in many motors, transmissions and rear ends in multiple applications , whenever you have two new metal surfaces making contact you will have initial wearin and metal dispersal into the fluid and onto the magnet.

    I always feel changing these fluids, and clearing those magnets allows them to do the job of capturing normal wear and tear particulars vs the initial heavier wear in metal that you see in this thread.

    It's definitely optional and not required but I am still looking for those fluid specifications if anyone has, much appreciated.
     
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  6. dmeyer302

    dmeyer302 Well-Known Member

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    #6 Sep 8, 2019
    Last edited: Sep 8, 2019
    I mean...................can’t you?
     

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