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Transfer Case Oil Change

Discussion in '2.5 Gen Tundras (2014-2021)' started by vanthesupreme, Oct 13, 2020.

  1. Oct 13, 2020 at 8:45 AM
    #1
    vanthesupreme

    vanthesupreme [OP] I'm Batman

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    I have looked at other threads on changing the diff fluid along with the transfer case. I have also watched a few YouTube videos on the process, but I an needing to know if the transfer case can use 75w-90 gear oil just like the rest of the diff fluids or if I need to use just 75w? The one youtube video I watched the guy used 75w-90 in the transfer. All input will be greatly appreciated and thanks in advance
     
  2. Oct 13, 2020 at 9:10 AM
    #2
    duerrs

    duerrs Semper Fi!

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    Wondering the same thing. On my 2008, I put Royal Purple 75W90 in all three. On my 2020, I've put Amsoil 75W90 in front and rear but not the transfer yet. I'm told they made a change to the transfer case in 2014 or some MY after that. Amsoil has no recommended oil for this yet.
     
    vanthesupreme[OP] likes this.
  3. Oct 13, 2020 at 9:14 AM
    #3
    Fotnot

    Fotnot SSEM #69; LRCS#1

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    I have all my stuff being delivered today (supposedly) to change out my front/rear diff and my transfer case. I'm using Mobil 1 Sythetic 75w-90. A few places I've found have all said that using that is completely fine. Now, per manual, specs, etc...they all say straight 75. I mentioned it to my dad yesterday actually that has owned a shop for 35+ years and said it is fine to do that. This is no means professional advice, but if it makes you feel better, I did my job. :cheers:
     
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  4. Oct 13, 2020 at 9:18 AM
    #4
    AZBoatHauler

    AZBoatHauler SSEM#140/ASCM#3/2ndGenNaysayer/BAF140

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  5. Oct 13, 2020 at 10:44 AM
    #5
    Porkchop Express

    Porkchop Express Its all in the reflexes

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    yes. I put Lucas synthetic in all three.
    75w90
     
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  6. Oct 13, 2020 at 12:11 PM
    #6
    vanthesupreme

    vanthesupreme [OP] I'm Batman

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    Thank you all for your input greatly appreciated!!
     
  7. Oct 13, 2020 at 12:55 PM
    #7
    OTX

    OTX 2018 Tundra SR5 Off-road Crewmax 4x4

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    I have been going back and forth about what oil to use on my 2018 Tundra transfer case. From my research, 75w90 is not really suitable as it’s much thicker than the 75w oil Toyota uses. Then you have Ravenol which is a 75w oil but from what I have researched is also quite different from the Toyota fluid when an oil analysis was done.

    I decided to get the original Toyota 75w oil and not chance it. It hurt paying $125 for 2 quarts of this stuff but when it only has to be changed every 60,000 miles, it’s worth it. A transfer case cost about $2800!!!. For the front and rear, I went ahead and put in 75w90 Mobil oil. My advice is go for the real deal as there is no real substitute for it!.
     
    vanthesupreme[OP] likes this.
  8. Oct 17, 2020 at 7:47 AM
    #8
    Rob's Inferno

    Rob's Inferno New Member

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    I bought and used Toyota 75w .truck is still under warranty so.And when i change the t case at 35000miles ,fluid looked as clean as the brand new fluid
     
    vanthesupreme[OP] likes this.
  9. Oct 17, 2020 at 9:30 AM
    #9
    The Patriot 1776

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    $125 for 2 quarts is asinine. Next time get
    https://www.blauparts.com/ravenol-manual-transmission-fluid-mtf-3-75w-1l.html
     
  10. Oct 17, 2020 at 9:43 AM
    #10
    Stumpjumper

    Stumpjumper New Member

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    I changed Tacoma at 50k and same thing. Unless you do a lot of driving in 4wd it is not going to look dirty. I am not changing it in my Tundra.
     
    vanthesupreme[OP] likes this.
  11. Oct 17, 2020 at 10:24 AM
    #11
    Vector W8

    Vector W8 Old guy with a lot of expensive habits.

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    Use the Toyota 75 weight oil. It has additives that prevent solenoid stick. Many people have changed it with a different oil and have had problems with shifting between two and 4 wheel drive. And then it not wanting to disengage.
     
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  12. Oct 17, 2020 at 10:35 AM
    #12
    Uhhhh....

    Uhhhh.... New Member

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    As some have already said, t-case calls for 75w. Diffs call for 75w-90.
     
    vanthesupreme[OP] likes this.
  13. Oct 17, 2020 at 1:55 PM
    #13
    Js18tundra

    Js18tundra New Member

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    I’ve been using redline mt-Lv for about 10k miles, it has worked flawlessly, shifts the same as stock, and its synthetic.
     
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  14. Oct 17, 2020 at 5:08 PM
    #14
    Sumo91

    Sumo91 Busy with projects

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    Ravenol 75w works great in mine, I'm in 4wd a few times a month at least and I drive the piss outta my truck
     
  15. Oct 17, 2020 at 7:33 PM
    #15
    Fotnot

    Fotnot SSEM #69; LRCS#1

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    I knocked mine out this weekend with a lil helo from my dad since he was helping me do brakes. Not difficult, but I forgot how much gear oil stinks. When I did the transfer case, it had more velocity than expected and got it on my clothes. They were trash clothes anyway, but it had the gear oil stank on it ha. All 3 were easy to do tho. We'll see how the transfer case does with mobil 1 75-90
     
  16. Oct 17, 2020 at 8:37 PM
    #16
    OTX

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    I ended up changing the transfer case fluid today in less than 20 minutes(mostly just waiting for it to drain). I am not a car guy whatsoever and I couldn’t believe how easy it was to do even without the truck being jacked up. Just take off the fill plug first and then do the same with the drain and let it drain for 10 minutes or so and then I put the Toyota 75w fluid in using a transfer fluid pump. Super easy.
     
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  17. Jul 23, 2021 at 3:07 PM
    #17
    Basso1964

    Basso1964 New Member

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    I just rang Toyota in Regina Canada, they actually use 75-90 in the transfer case. So now I am going with Mobil 1 the whole way. Walmart has 12 bottles for 175!
     
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  18. Jul 23, 2021 at 5:17 PM
    #18
    Unclebuck

    Unclebuck New Member

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    75-90 is fine. A thicker oil (compared to straight 75W) in the TC is not going to hurt a damn thing. Like others have found out - many dealerships use 75w-90 for TC changes - the two dealerships I checked with use a multi-visc oil and not the straight 75w.

    Change it regularly and it wont matter whether a single viscosity 75w or a multi-viscosity 75w-90w.
     
    Last edited: Jul 24, 2021
  19. Jul 26, 2021 at 9:22 AM
    #19
    Basso1964

    Basso1964 New Member

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    Thanks Mate!
     
  20. Jul 26, 2021 at 10:23 AM
    #20
    crewmaxlmt

    crewmaxlmt How dare you!

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    These are wise words. I would stop visiting any dealership using 75-90 in this transfer case.
     
  21. Jul 26, 2021 at 11:51 AM
    #21
    duerrs

    duerrs Semper Fi!

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    I disagree. My local dealer also uses 75-90 or GL5 in all 2014's and up. I decided to use the Amsoil 75w90 Severe Gear in my 2020 transfer case just like I used in the front and rear diffs. Believe it or not, the truck engages and disengages 4WD quicker since the change! 42,000 miles and two winters with no problems. I'm not worried at all about my decision. If this was an issue, there wouldn't be as many dealers using the same gear oil in all three as we keep hearing about.
     
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  22. Jul 26, 2021 at 11:57 AM
    #22
    AZBoatHauler

    AZBoatHauler SSEM#140/ASCM#3/2ndGenNaysayer/BAF140

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    So you took the gear oil out of the transfer case on a brand new truck and replaced it with 75-90? Why?
     
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  23. Jul 26, 2021 at 12:03 PM
    #23
    duerrs

    duerrs Semper Fi!

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    Yep...converted most of the truck over to Amsoil. Engine, transmission (partially so far - 6 quart drain/fill), diffs, transfer case and power steering fluid. Only thing I haven't changed is brake fluid and coolant. Plan on keeping this truck for a very long time and believe in the Amsoil product. To each their own as they say! ;)
     
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  24. Jul 26, 2021 at 12:10 PM
    #24
    crewmaxlmt

    crewmaxlmt How dare you!

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    If you plan on keeping your truck for a long time, you might want to switch the transfer case back to 75W. These transfer cases do not use a gear lube. These use an advanced fully synthetic oil formulated by Toyota for transfer cases.

    I used to think that all gear lubes were the same then I started my research into swapping out both of my differentials. Oil thickness, too slippery, not slippery enough, additive, or no additive; it all matters. For instance, I could not use Amsoil with the differential that I am putting in my truck. It would not work properly since it has too much lubricity.
     
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  25. Jul 26, 2021 at 12:20 PM
    #25
    Ely010606

    Ely010606 New Member

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    I was in the same boat also. I was going to use the 75w90 for my TCase since I’m using that for my front and rear diff. I backed out and ended up buying the 75W, it sure freakin cost more for 2 cans but I have the peace of mind.
     
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  26. Jul 26, 2021 at 12:30 PM
    #26
    duerrs

    duerrs Semper Fi!

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    Whatever lets you sleep at night. I sleep better knowing I have Amsoil in mine. Plus, as mentioned, it shifts to/from 4WD quicker than the 75W that it came with.

    I'll keep you updated as to whether or not I have problems. I plan on putting over 500,000 on this truck! :fingerscrossed:
     
  27. Jul 26, 2021 at 12:33 PM
    #27
    jordoncloutier

    jordoncloutier New Member

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    I've used Amsoil severe gear 75w90 in my 2019 CM transfer case without any issue , just did a fluid change last week , decided to give Royal Purple Syncromax a try. its spec'd to be a suitable replacement for toyota's 75w oil . plus its way cheaper too . So far no change in performance between the 2 fluids . lets not over think this subject .
     
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  28. Jul 26, 2021 at 12:36 PM
    #28
    Unclebuck

    Unclebuck New Member

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    If there are additives -
    Its a friggin' transfer case, not a human heart requiring the proper blood type and rh factor to work. Even Toyota accepts that 75w-90 is acceptable. FFS - I never would have guessed that TC oil would become the "whats the best oil" argument. It is gears and chains, not a internal combustion engine.
     
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  29. Jul 26, 2021 at 12:52 PM
    #29
    crewmaxlmt

    crewmaxlmt How dare you!

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    Not just gears and chains on this one. FWIW, my last three 4x4's dating back to the 90's used ATF not gear oil. I believe the lighter ATF is used for better heat dissipation.
     
  30. Jul 26, 2021 at 1:31 PM
    #30
    Unclebuck

    Unclebuck New Member

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    So these TCs need ATF and not gear oil. Good to know
     

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