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Gear Oil Weight and Spec

Discussion in '1st Gen. Tacomas (1995-2004)' started by montanabay, Jun 28, 2010.

  1. Jun 28, 2010 at 9:10 AM
    #1
    montanabay

    montanabay [OP] Active Member

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    Hi All,

    First Question, I've come across a few different sources that GL-5 gear oil can be corrosive in certain gear boxes, particularity Japanese made transfer cases because of the high sulfur content and specific metals in there transfer cases.

    My manual for my 1996 Taco says GL-4 for the transfer case and GL-4 or 5 for the differentials. My question is, can we put GL-5 in our transfer case or is it one of these sensitive metal cases?

    I ask because no one carries GL-4 spec oil around here, everything is GL-5, so I wonder if GL-5 has evolved to be safer with specific metals?

    Second question, my rear diff is rated for 75w-90 oil, if I put in 90w-140 would it have any negative impact on the diff, or just more protection with more resistance (less mpg)? I tow with my truck, so I want to make sure she' as protected as possible.


    Thanks!

    Josh
     
  2. Jun 28, 2010 at 9:15 AM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    You can put a synthetic GL-4/5 in the transfer/tranny with out issue. Dyno GL-5 will SLOWLY eat any copper alloy which happens to be the bronze synchros in the W58/59 tranny.

    Stick with the recommended 75w-90 in the diffs, or go synthetic.
     
  3. Jun 28, 2010 at 9:40 AM
    #3
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Toyota does say a GL-5 is fine in their tranny though.
     
  4. Jun 28, 2010 at 10:07 AM
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    Janster

    Janster Old & Forgetful

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    I had a 96 tacoma and I put Mobile 1 75W-90 gear oil in everything!!!
    Front diff, rear diff, transfer case, & manual transmission.

    And since you tow...use the recommended oil and just change it more often.

    Using a 90-140w oil could cause more problems because the oil is too thick. Too thick = not flowing properly to lubricate the diff & wheel bearings properly.
     
  5. Jun 28, 2010 at 8:35 PM
    #5
    kumaWRX

    kumaWRX Well-Known Member

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    I just replaced my diff oil with Royal Purple 75W90.
     
  6. Jun 28, 2010 at 8:39 PM
    #6
    pittim

    pittim mittip

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    GL4 in the trans and case, GL5 in the diffs.

    check out www.racerpartswholesale.com its the best price for what i plan on putting in my truck whenever i get around to it (Redline 75w-90 in diffs , MT-90 in trans and case)
     
  7. Feb 2, 2012 at 7:53 AM
    #7
    bluebr65

    bluebr65 Active Member

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    Does this still hold true? I just put GL5 Mobil 1 75w90 synthetic in my tcase and manual trans (2001 2.7). Have I made a huge mistake??
     
  8. Feb 2, 2012 at 8:51 PM
    #8
    Norton

    Norton Well-Known Member

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    Is this a trick question? He said "put a SYNTHETIC GL-4/5 in the transfer/tranny with out issue... DYNO GL-5 will slowly eat..." You said "I just put GL5 Mobil 1 75w90 SYNTHETIC in..."

    Translation: You're using SYNTHETIC, so you're fine.
     
  9. Feb 2, 2012 at 9:12 PM
    #9
    shampoop

    shampoop Well-Known Member

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    Redline MT fluid specifically states it is compatible with both GL4 and GL5
     
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