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Lucas 85w-140 for transfer case?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by mtmudrunner, Apr 29, 2018.

  1. Apr 29, 2018 at 7:24 AM
    #1
    mtmudrunner

    mtmudrunner [OP] Well-Known Member

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    I know ECGS recommends it for the difs, has anyone used it in the transfercase or is it too heavy? I got a good deal on a case.

    Case not csse :annoyed:
     
  2. Apr 29, 2018 at 7:53 AM
    #2
    Nomad_Pilot

    Nomad_Pilot I need to pewp

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    I wouldn't. I put what toyota recommends. Will it hurt anything?........I doubt it
     
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  3. Apr 29, 2018 at 12:46 PM
    #3
    badger

    badger Well-Known Member

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    NOT a good idea! The transfer case uses an internal pump to lubricate it, with a very fine filtering screen. A higher viscosity lube would likely starve the case of proper lubrication. I would also not use any oil additives. I have seen some plug this screen. A good synthetic oil in the proper viscosity is best.
     
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  4. Apr 29, 2018 at 1:42 PM
    #4
    mtmudrunner

    mtmudrunner [OP] Well-Known Member

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    That's what I needed to know thanks
     
  5. Apr 29, 2018 at 2:14 PM
    #5
    jowybyo

    jowybyo Mobtown Offroad

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    Is it actual fact or just your opinion that the higher viscosity is bad for the pump? Not trying to start anything, just curious cause I run Lucas 85W140 and I’m wondering if I absolutely need change it.
     
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  6. Apr 29, 2018 at 2:15 PM
    #6
    mtmudrunner

    mtmudrunner [OP] Well-Known Member

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    How long have you been running it?
     
  7. Apr 29, 2018 at 2:38 PM
    #7
    jowybyo

    jowybyo Mobtown Offroad

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    About 20k miles.
     
  8. Apr 29, 2018 at 3:04 PM
    #8
    badger

    badger Well-Known Member

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    All I know for a fact is that the screen is small and very fine. It is meant for a thinner oil. A thicker oil will have a harder time getting through, which means less oil. The problem is, we won't know for SURE until yours fails. If it were mine, I would change it.
     
  9. Apr 29, 2018 at 3:08 PM
    #9
    jowybyo

    jowybyo Mobtown Offroad

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    The more I think about it the less I’m worried about it. I swapped to a FJ t-case, it was only $250. I’ll swap in another if it blows up I guess. I’ll be sure to report back if it goes to shit.
     
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  10. Apr 29, 2018 at 3:11 PM
    #10
    BillsSR5

    BillsSR5 Looking out for #1

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    why would u want to use a 85w140?
     
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  11. Apr 29, 2018 at 3:55 PM
    #11
    jowybyo

    jowybyo Mobtown Offroad

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    I’m not sure now. I think I remember reading something where they did a tear down one a transfer case using 75W-90 vs 85W-140 and the heavy oil one looked better. I’m having trouble finding the thread. When I regeared I just went ahead and changed all the gear oils to 85W-140.
     
  12. Apr 29, 2018 at 4:06 PM
    #12
    mtmudrunner

    mtmudrunner [OP] Well-Known Member

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    Using the same fluids in all three is what I would like to do but it's not a deal breaker I'm going to use the 85w-140 in the front and rear but still unsure on the t-case.
     
  13. Apr 29, 2018 at 8:34 PM
    #13
    07 sport 4x4

    07 sport 4x4 Well-Known Member

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    For whatever it’s worth I’m aiming to go with 85w-140 in my LSD rear on my 07 taco and stay with 75w-90 in the t-case and front diff when I change them all again at 90k. I have used 80w-90 in the rear diff up to this point, I tried 75w-90 in the rear diff once but it chattered with synthetic in it...even with extra lsd additive. Went back to conventional 80w-90 and a few oz of friction modifier, all is good.
     
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  14. Apr 29, 2018 at 8:43 PM
    #14
    badger

    badger Well-Known Member

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    I have been using 85w110 Redline in the rear diff for some time, but 75W-90 in the front. The front never sees the heat or the speed that the rear does. I don't use hypoid gear oil in my manual transmission or transfer case. I use Redline MT-90 in both. My transfer case has over 200,000 miles on it with zero issues. It's an FJ twin stick transplant.

    The transfer case never sees anywhere close to the heat that the rear diff does, nor does it see the pressures generated by hypoid gears, so I see no need at all for the high viscosity oil.
     
  15. Apr 29, 2018 at 8:59 PM
    #15
    badger

    badger Well-Known Member

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    The needs of all three are different. The 85-140 is fine in the rear. The front doesn't need it at all, and the T-case is a completely different type of gear box. It's a small expense every couple of years, and the left overs will keep till the next change. I don't want to be the voice of doom, but I see only potential downside to using 85w-140 in the T-case, no upside.
     
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  16. Apr 30, 2018 at 9:18 AM
    #16
    knottyrope

    knottyrope Well-Known Member

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    heavier oil can affect MPG in the diff

    Heavier oil does not mean better protection

    in cold climates, heavy oil can be bad or not let thins work until warmed up
     
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  17. Apr 30, 2018 at 9:48 AM
    #17
    TacomaMike37

    TacomaMike37 Well-Known Member

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    CHALLENGE
     
  18. Dec 10, 2018 at 6:48 PM
    #18
    KaptainH

    KaptainH Well-Known Member

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    Do you still use the 85w140 in the tcase? Trying to decide if I wanna stick with all the same oils
     
  19. Dec 10, 2018 at 7:03 PM
    #19
    jowybyo

    jowybyo Mobtown Offroad

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    Yea
     
  20. Dec 11, 2018 at 10:29 AM
    #20
    96carboard

    96carboard Well-Known Member

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    If you like to be stuck in 2wd, then go ahead. But if you like to be able to use 4wd, keep it to 90.
     

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