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Rear Differential Fluid

Discussion in '2nd Gen. Tacomas (2005-2015)' started by GorgeRunner, Nov 20, 2019.

  1. Nov 20, 2019 at 10:57 AM
    #1
    GorgeRunner

    GorgeRunner [OP] Out There

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    Been slowly but surely getting this truck squared away since I brought and I'm down to the last task: changing the rear diff fluid. I have the locking differential(which came in real handy on a recent drive through deep sand), what's the best fluid I can use. Should I use LSD additives(on the truck)?
     
  2. Nov 20, 2019 at 10:58 AM
    #2
    BassAckwards

    BassAckwards Well-Known Member

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    75w90 for stock use, no LSD additives required.

    You can also step up to an 85w140 weight Lucas if you want a little more protection
     
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  3. Nov 20, 2019 at 11:03 AM
    #3
    Colin The Shots

    Colin The Shots Well-Known Member

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    Isn't LSD additive used on 2005 - 2008 trucks with the mechanical LSD?
     
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  4. Nov 20, 2019 at 11:04 AM
    #4
    whatstcp

    whatstcp currently drunk so don't listen to me

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  5. Nov 20, 2019 at 11:05 AM
    #5
    BassAckwards

    BassAckwards Well-Known Member

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    Yes 05-08 TRD sports will need the additive. OP has a TRD OR though
     
  6. Nov 20, 2019 at 11:06 AM
    #6
    GorgeRunner

    GorgeRunner [OP] Out There

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    I'm not 100% sure. I just read if you have the rear diff lock button it's LSD.
     
  7. Nov 20, 2019 at 11:06 AM
    #7
    Beretta4x4

    Beretta4x4 What makes the green grass grow? TTC#0114

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    It's not an LSD. I'm 100% sure.
     
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  8. Nov 20, 2019 at 11:08 AM
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    TacomaWilly

    TacomaWilly Well-Known Member

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    You only need the LSD additive for mechanical LSD which is 2005 to 2008 models as mentioned above ^
    I used 80W90 with Posi-Trac additive and it works like a beauty. No more shudder when I put the foot down on a tight corner.
    I personally don't see a benefit of using the synthetic (75W90). It's 3x the price and the conventional lasts two years anyways.
     
  9. Nov 20, 2019 at 11:08 AM
    #9
    eon_blue

    eon_blue Unknown Member

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    The rear diff lock and LSD are two different things. The rear diff locker is a locking differential, the LSD is a limited slip differential. TRD ORs come with the locking diff, TRD Sports from 2005 - 2008 come with the limited slip (and require LSD additive). 2009+ Sports do not have a real LSD, just a brake feature that mimics one.

    You can use gear oil with LSD additive in the locking diff if you want...but it's not necessary. Won't hurt anything though.
     
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  10. Nov 20, 2019 at 11:12 AM
    #10
    Colin The Shots

    Colin The Shots Well-Known Member

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    Oh ok I just thought the trd offroad still had LSD in normal operation and locked differential when the locker is engaged.
     
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  11. Nov 20, 2019 at 11:15 AM
    #11
    GorgeRunner

    GorgeRunner [OP] Out There

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    I love it when the cheapest option is best. Is there really an advantage to heavier oil like 85-140?
     
  12. Nov 20, 2019 at 11:15 AM
    #12
    eon_blue

    eon_blue Unknown Member

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    I don't know if the newer TRD ORs might have the same 'pretend LSD' braking feature that the 09+ Sports have...it very well might. But because there isn't an actual limited slip in them, no LSD additive is needed. Can't have a mechanical LSD and a locker in the same diff, two completely separate devices for traction.
     
  13. Nov 20, 2019 at 11:19 AM
    #13
    Colin The Shots

    Colin The Shots Well-Known Member

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    Ok but I was talking about the original poster looks like he drives an 05. Anyway good info. I didn't know they were completely different.
     
  14. Nov 20, 2019 at 11:20 AM
    #14
    nd4spdbh

    nd4spdbh Well-Known Member

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    Nope standard open diff without clutch packs on the elocker diff (doesnt mater the model year)

    Elocker diff doesnt care if you put LSD additive in it. I rock mobil 1 75w-90 in my rear diff (that has LSD additive in it) without issue.
     
  15. Nov 20, 2019 at 11:21 AM
    #15
    eon_blue

    eon_blue Unknown Member

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    Oh gotcha, I thought we were talking about the other guy you quoted earlier. Yeah it does say he's an 05, but since he has a TRD OR he has a rear diff locker and therefore no LSD, so no additive required.
     
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  16. Nov 20, 2019 at 11:22 AM
    #16
    TacomaWilly

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    I think heavier oil is for warmer climate + heavy usage. The hotter your diff. gets, the thinner the oil becomes and the less protection it can provide.
     
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  17. Nov 20, 2019 at 11:22 AM
    #17
    GorgeRunner

    GorgeRunner [OP] Out There

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    This is why I asked about it. Learn something every day.
     
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  18. Nov 20, 2019 at 11:24 AM
    #18
    eon_blue

    eon_blue Unknown Member

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    a lot of guys that offroad their trucks really hard will put heavier gear oil in the diffs for added protection against heat that builds up fast when you're wheeling. But if you live in a really cold climate it might not be a good idea, since that heavier oil is thicker
     
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  19. Nov 20, 2019 at 11:27 AM
    #19
    GorgeRunner

    GorgeRunner [OP] Out There

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    I drive off road a lot, but definitely not wheeling. I need to get home. 75-90w should work for my mixed terrain driving.

    If the Walmart Supertech 75-90w at $6.95/qt is good, 3 qts and a $5 pump, about $25, well worth it.

    I used to race cars and spent a lot of time in Baja. I prefer to prevent as many problems as possible instead of (off)roadside repair. Can't win if you don't finish.
     
    Last edited: Nov 20, 2019
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  20. Nov 20, 2019 at 11:28 AM
    #20
    Beretta4x4

    Beretta4x4 What makes the green grass grow? TTC#0114

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    You'll be perfectly fine with that. I run 75-90 in both of my diffs and wheel semi-frequently. This is also my DD.
     

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