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Diff Oil Change

Discussion in 'Wrangler TJ (1996-2006)' started by TJ4me, Sep 16, 2019.

  1. Sep 16, 2019 at 3:49 AM
    #1
    TJ4me

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    TJ4me [OP] Active Member

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    Hello Everyone-
    I'm changing the oil in my two differentials.
    I've read that 75w - 140 is the recommended oil.
    Would you agree?
    Thanks for the input..
     
    TJ4me, Sep 16, 2019
    #1
  2. Sep 16, 2019 at 5:57 AM
    #2
    Awrench

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    Awrench Well-Known Member

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    Lubricant for axles intended for heavy-duty or trailer tow use is SAE 75W–140* , and don't forget a trac loc rear diff would need a friction modifier

    * SYNTHETIC nice but do the math
     
    Awrench, Sep 16, 2019
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  3. Sep 16, 2019 at 12:43 PM
    #3
    LYFZGOOD

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    LYFZGOOD members

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    I put SYNTHETIC in mine and now it’s leaking. Do you think there’s anything to that???
     
    LYFZGOOD, Sep 16, 2019
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  4. Sep 16, 2019 at 1:27 PM
    #4
    aggrex

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    aggrex Well-Known Member

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    Where's the leak? Drain/fill plug?
     
    aggrex, Sep 16, 2019
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  5. Sep 16, 2019 at 3:43 PM
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    LYFZGOOD

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    Nope I thought I overfilled it and it was coming out of the axle tubes but the level is OK and if I park it on an incline sideways it runs out The axle tube I was going to replace my axle seals but started thinking I put synthetic oil in it I wondered if that made any difference
     
    LYFZGOOD, Sep 16, 2019
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  6. Sep 16, 2019 at 6:12 PM
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    JKBob 25

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    JKBob 25 Well-Known Member

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    Should have nothing to do with what type of oil you used. It's the same weight as you replaced. Probably an axle seal.
     
    JKBob 25, Sep 16, 2019
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  7. Sep 16, 2019 at 6:34 PM
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    LYFZGOOD

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    Ok. 10-4 thanks
     
    LYFZGOOD, Sep 16, 2019
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  8. Sep 16, 2019 at 6:38 PM
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    TJ4me

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    TJ4me [OP] Active Member

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    Thanks for the feedback.
    I'm going with the 75w - 140 synthetic.
    I found it for just under $12 at Walmart.
    I figure it's worth it with such long intervals between changes...
     
    TJ4me, Sep 16, 2019
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  9. Sep 16, 2019 at 6:45 PM
    #9
    JKBob 25

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    JKBob 25 Well-Known Member

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    Dude...if you can get 80w 90 cheaper. Go for it. 75w 140 is recommended for when towing stuff. You didnt mention it. So i figure your not.
     
    JKBob 25, Sep 16, 2019
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    chris4x4 likes this.
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