1. Welcome to Tundras.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Rear Diff maintenance?

Discussion in '2.5 Gen Tundras (2014-2021)' started by awq735, Oct 8, 2022.

  1. Oct 8, 2022 at 6:46 AM
    #1
    awq735

    awq735 [OP] New Member

    Joined:
    Apr 8, 2019
    Member:
    #28824
    Messages:
    204
    Gender:
    Male
    First Name:
    Anthony
    Ohio
    Vehicle:
    2019 Tundra Sport, MGM
    About to do my 40k oil change and also want to replace my rear differential fluid as well. I tow a 7k camper 5-7 times a year, anywhere from 1-5 hours each way. Am I crazy for wanting to replace the rear diff fluid? I was looking at Valvoline 75W-90 gear oil from autozone for $10.99 a quart. Also, anyone have a part number for the rear diff fill and drain plug gaskets? I've reused aluminum gaskets with much success, and if they are aluminum I'm assuming I'd have the same success!?
     
  2. Oct 8, 2022 at 7:11 AM
    #2
    frichco228

    frichco228 Valued Member

    Joined:
    Jan 9, 2020
    Member:
    #40952
    Messages:
    4,573
    Gender:
    Male
    First Name:
    Frank
    Virginia
    Vehicle:
    2016 Crewmax 4WD, TRD Offroad
    Eibach Pro Truck Stage 2 suspension, HD RAS, 285/75-18 Nokian Outpost AT, LoPro bed cover, TRD rear sway bar, DD 10 inch exhaust, and various other goodies
    Diff fluid changes are normal maintenance. As is trans and xfer case drain and fills.
     
  3. Oct 8, 2022 at 7:20 AM
    #3
    MadMaxCanon

    MadMaxCanon New Member

    Joined:
    May 27, 2021
    Member:
    #63566
    Messages:
    4,023
    Gender:
    Male
    SoCal
    Vehicle:
    '21 CM SR5 4x4 6 seater
    Too many, but not enough....
    I changed my diff fluid for the first time at 20k. It was really bad. I don't tow but I offroad and load the truck to max payload often enough. You should change it now. I will check it again to see the condition after 10 or 15k to see how it wears normally.
     
  4. Oct 8, 2022 at 7:22 AM
    #4
    MadMaxCanon

    MadMaxCanon New Member

    Joined:
    May 27, 2021
    Member:
    #63566
    Messages:
    4,023
    Gender:
    Male
    SoCal
    Vehicle:
    '21 CM SR5 4x4 6 seater
    Too many, but not enough....
    You can get the gasket kit on Amazon for 10 bucks. I recently bought 24 quarts because the price was amazing at 8 bucks a quart for synthetic. Normally it's twice that at autozone.
     
  5. Oct 8, 2022 at 7:30 AM
    #5
    JLS in WA

    JLS in WA New Member

    Joined:
    Jan 1, 2020
    Member:
    #40610
    Messages:
    1,336
    Gender:
    Male
    Somewhere in the basalt rocks with my dogs
    Vehicle:
    2008 White DC Limited 4x4
    Drahthaar Transport Unit
    I do front, rear and transfer case every 30k.

    Differential and Transmission Drain Plug Crush Washers Gaskets Fits for Toyota 4runner Tacoma Tundra FJ cruiser Land Cruiser, Replacement for the part# 12157-10010 90430-24003 90430-18008 https://www.amazon.com/dp/B07DFJ24WD

    I use Amsoil in the cases, but I’m sure Mobil 1 or something similar is just fine.
     
    coldcanuk, KOTOC79, Durania and 6 others like this.
  6. Oct 8, 2022 at 8:22 AM
    #6
    KNABORES

    KNABORES Sarcasm incoming

    Joined:
    Jan 1, 2020
    Member:
    #40572
    Messages:
    10,071
    Gender:
    Male
    Arkansas
    Vehicle:
    2000 Limited TRD AC 4X4 Thunder Grey 270k miles. 2019 Limited TRD CM 4x4 Cement Grey 75k miles
    2000: Bilstein 5100's 16x8 589's with 265/75/16 and 1.25" spacers Flowmaster 50 series over the axle dump Pioneer touchscreen with backup camera Full interior and dash LED conversion Trailer brake controller with 7 pin Bedliner coat bumpers & trim ARE topper 2019: ARE topper with full Bedrug kit and Vortex rack TRD shifter 1.25" wheel spacers (I like to live dangerously) Red tow hooks for that +15 grip bonus
    Rear diff fluid (non-synthetic) will always look “bad” and smell really bad when you change it. It’s gross stuff. The synthetic fluid is more pleasant appearing and smelling when changing in my experience. None of that means it’s not working though. If you have water in it, that’s bad. If it’s murky and appears contaminated, that’s bad. It gets hot and experiences a lot of shear and should be changed at the recommended intervals or sooner for severe use or deep water driving.
     
    Wallygator likes this.
  7. Oct 10, 2022 at 4:50 AM
    #7
    Stumpjumper

    Stumpjumper New Member

    Joined:
    Sep 15, 2016
    Member:
    #4546
    Messages:
    3,323
    Gender:
    Male
    Fate, Tx
    Vehicle:
    2017 Tundra TSS 4x4
    I never buy fluids at Auto Zone or any other auto parts store. Cheaper at WalMart if they have what you need. 3 diff oil changes on Tacomas and 2 on Tundra and have never changed a washer and never had a leak.
     
  8. Oct 10, 2022 at 5:57 AM
    #8
    Hugemoose

    Hugemoose New Member

    Joined:
    Oct 21, 2019
    Member:
    #37634
    Messages:
    496
    Gender:
    Male
    First Name:
    David
    Philly
    Vehicle:
    2016 Tundra Crewmax
    Not enough....
    Changing all your fluids at 40k is certainly a good idea. The washer kit that was posted above is certainly a good idea, I think I actually bought the same one.

    For oil I used this: https://www.blauparts.com/toyota-tundra-transfer-case-differential-fluid-change-kit.html It is the correct oil for both front and rear diffs, and more importantly your transfer case. That 75W oil, from Toyota, is extremely expensive. Of course if you don't have a 4x4 you can save some money and not buy the full kit.
     
    bulldog93 and Charliebrn like this.
  9. Oct 10, 2022 at 2:15 PM
    #9
    Stumpjumper

    Stumpjumper New Member

    Joined:
    Sep 15, 2016
    Member:
    #4546
    Messages:
    3,323
    Gender:
    Male
    Fate, Tx
    Vehicle:
    2017 Tundra TSS 4x4
    It is not about saving pennies. Just don't need to change them and never have.
     
    snivilous and Jaypown like this.
  10. Oct 11, 2022 at 2:36 PM
    #10
    Avi8or

    Avi8or New Member

    Joined:
    May 22, 2020
    Member:
    #46920
    Messages:
    168
    Gender:
    Male
    First Name:
    Johann
    MO
    Vehicle:
    2020 Limited Crewmax
    Ravenol claims the 75W is a direct replacement for the Toyota transfer case fluid, but the additive packs are not the same between the two. Don’t know how much it matters, but they are not the same fluid.
     
  11. Oct 11, 2022 at 2:52 PM
    #11
    georgiey22

    georgiey22 Moving to Idaho

    Joined:
    Nov 30, 2018
    Member:
    #22423
    Messages:
    857
    Gender:
    Male
    Vehicle:
    2019 Tundra | TRD Sport | Cavalry Blue | Crew Max
    bulldog93, WILLINH and KNABORES like this.
  12. Oct 11, 2022 at 4:26 PM
    #12
    WILLINH

    WILLINH New Member

    Joined:
    Jul 16, 2019
    Member:
    #33280
    Messages:
    3,310
    Gender:
    Male
    First Name:
    BILL
    NEW HAMPTON, NH
    2019 TUNDRA
    I changed front, rear differential and transfer case every 30,000 with synthetic 75-90. None of the old fluid looked bad at all. Just try to keep up with it and you will be good.
     
    Last edited: Oct 11, 2022
    omgboost and Johnsonman like this.
  13. Oct 11, 2022 at 5:04 PM
    #13
    Hugemoose

    Hugemoose New Member

    Joined:
    Oct 21, 2019
    Member:
    #37634
    Messages:
    496
    Gender:
    Male
    First Name:
    David
    Philly
    Vehicle:
    2016 Tundra Crewmax
    Not enough....
    Yes I have seen that too. I tried to do my best homework on it, and so far I've used 4wd quite a bit and have had no issues. I do plan to change it once I hit 30k miles.

    Having said that, another forum member had almost 60k on his Ravenol 75w transfer case fluid and when he drained it, it was very dark. However, the oil analysis showed it was in perfectly fine shape. So even though the additive packages might be different, it still may be suitable?? Who knows lol. Let's just hope it holds up and keeps working.

    Screenshot_20220520-171119_Acrobat for Samsung.jpg
     
    Henry1jg likes this.
  14. Oct 11, 2022 at 6:37 PM
    #14
    Stumpjumper

    Stumpjumper New Member

    Joined:
    Sep 15, 2016
    Member:
    #4546
    Messages:
    3,323
    Gender:
    Male
    Fate, Tx
    Vehicle:
    2017 Tundra TSS 4x4
    Changed the Tcase oil on my Tacoma at 50k and it looked like it came out of the bottle. Not sure if 4wd use has any effect on the oil but I figure less then 1% of miles are with 4wd engaged.
     
    WILLINH likes this.
  15. Oct 12, 2022 at 6:24 AM
    #15
    Hugemoose

    Hugemoose New Member

    Joined:
    Oct 21, 2019
    Member:
    #37634
    Messages:
    496
    Gender:
    Male
    First Name:
    David
    Philly
    Vehicle:
    2016 Tundra Crewmax
    Not enough....
    Yeah I honestly don't know if it has an effect, but I sort of assume it does?? I know when I drained the fluids that were in my T-case and diffs, the front diff and T-case looked pretty damn decent. I assume it was OEM Toyota fluid, but as I bought the truck used I don't have the full history on it. I do know it was a highway queen though so it probably never got used in 4wd lol.

    If the Ravenol is shit when I change it 20+k miles from now, I'll spend the extra money on OEM stuff. I'm just a cheap bastard.....
     
  16. Oct 12, 2022 at 3:03 PM
    #16
    ColoradoBoo

    ColoradoBoo New Member

    Joined:
    Dec 3, 2017
    Member:
    #11330
    Messages:
    189
    Gender:
    Male
    First Name:
    Rick
    Vehicle:
    2014 Red Toyota Tundra 4X4 TRD Maxcrew
    Firestone Airbags; remote starter; replaced stock mirrors with larger, pull-out mirrors for towing; hard plastic sectional cover for bed.
    Yep I do my front/rear and transaxle diffs every 3-years. I buy the kits from Blauparts.com and they have the Ravenol brand and the bottles have cool nipples that extend out so you can hold them up to the fill holes and just squeeze it in...no stupid pumping required. These are my notes from my last job:

    -Front Diff: Do FIRST as there's not a lot of room so have to use multiple bottles. Takes 2 Qts of 75W-85
    -Transaxle: Takes 2 Qts, 75W (do last as it's next to the hot exhaust pipes)
    -Rear: Takes 4 Qts, 75W-85

    Dang, when I ordered the kit in July 2021, it was $135. Now, it's up to $196...crazy inflation we have: https://www.blauparts.com/toyota-tundra-transfer-case-differential-fluid-change-kit.html

    This is a great video of a guy using the Ravenol oil....very helpful...

     
  17. Oct 13, 2022 at 7:37 AM
    #17
    ColoradoBoo

    ColoradoBoo New Member

    Joined:
    Dec 3, 2017
    Member:
    #11330
    Messages:
    189
    Gender:
    Male
    First Name:
    Rick
    Vehicle:
    2014 Red Toyota Tundra 4X4 TRD Maxcrew
    Firestone Airbags; remote starter; replaced stock mirrors with larger, pull-out mirrors for towing; hard plastic sectional cover for bed.
    Doesn't hurt to do more than less! I've asked a number of mechanics on their interval opinions and they say every 3-4 years, 40,000-50,000 should be fine. My Tundra is primarily used for pulling our RV in the summer, 5-6 times, and when we get bad winter weather so I'm only putting 5,000 miles a year. She only has 46,000 miles on her.
     
    Hugemoose likes this.
  18. Oct 13, 2022 at 7:39 AM
    #18
    Hugemoose

    Hugemoose New Member

    Joined:
    Oct 21, 2019
    Member:
    #37634
    Messages:
    496
    Gender:
    Male
    First Name:
    David
    Philly
    Vehicle:
    2016 Tundra Crewmax
    Not enough....
    Yeah I'm in a similar boat. I might put 5k miles on a year. I just use it when I need to for towing, moving big stuff etc. Or when my DD or the wifes need some work. I'm sure it'll be a while until I drain the Ravenol that's in my truck lol
     
    ColoradoBoo[QUOTED] likes this.
  19. Oct 13, 2022 at 7:49 AM
    #19
    bsktball55

    bsktball55 New Member

    Joined:
    Aug 1, 2016
    Member:
    #4056
    Messages:
    1,266
    Gender:
    Male
    First Name:
    Ryan
    Missouri
    Vehicle:
    16 Tundra TRD Pro
    Bakflip MX4 Toneau cover Esp storage Audio system (Helix speakers, JL audio amp and sub) Front windows and windshield tinted LED interior and bed lights
    I just did mine for the first time this spring. It was actually the first time I have ever changed my diff oil on any of my trucks. My truck had about 90,000 miles on it and the oil still looked good.
     
    mundra and ColoradoBoo like this.
  20. Oct 13, 2022 at 7:50 AM
    #20
    xtyfighterx

    xtyfighterx New Member

    Joined:
    Aug 28, 2016
    Member:
    #4360
    Messages:
    2,355
    Gender:
    Male
    First Name:
    Ty
    North Idaho
    Vehicle:
    2015 Black Crewmax Mid Travel
    Mid travel fox 2.5 coilovers 2.0 real shocks shims 295 70 18 trail grapplers pro accessories 32in light bar blacked out bed cover sway bar Moto metal 970 18x9
    I do my diffs And transfer case every 60k just did my first one and fluid looked fine. Do the trans at 100k
     
  21. Oct 13, 2022 at 8:20 AM
    #21
    MadMaxCanon

    MadMaxCanon New Member

    Joined:
    May 27, 2021
    Member:
    #63566
    Messages:
    4,023
    Gender:
    Male
    SoCal
    Vehicle:
    '21 CM SR5 4x4 6 seater
    Too many, but not enough....
    Not sure what kind of driving people are doing but i do some offroading a couple times a month and do not tow, and my fluid looked as black as the devils heart when i changed it at 20k. Maybe it was because it was the first change, but I cant imagine waiting longer than 20k for the next change.
     
    coldcanuk likes this.
  22. Oct 13, 2022 at 8:21 AM
    #22
    eharri3

    eharri3 New Member

    Joined:
    Jul 3, 2018
    Member:
    #16695
    Messages:
    1,084
    Gender:
    Male
    Vehicle:
    2021 F150 Powerboost
    I barely towed and changed my front and rear and transfer case every couple years on my Gen2.
     
  23. Oct 13, 2022 at 9:30 AM
    #23
    Wallygator

    Wallygator Well Zippedy Da Do!

    Joined:
    Apr 7, 2020
    Member:
    #44761
    Messages:
    2,563
    Royal Purple Syncromax is what I use in the transfer case. It is compatible and a direct replacement for the Toyota gold fluid per Royal Purple specifications
     
    WILLINH likes this.
  24. Oct 13, 2022 at 9:37 AM
    #24
    Hugemoose

    Hugemoose New Member

    Joined:
    Oct 21, 2019
    Member:
    #37634
    Messages:
    496
    Gender:
    Male
    First Name:
    David
    Philly
    Vehicle:
    2016 Tundra Crewmax
    Not enough....
    So is the Ravenol, but both might not exactly the same. Still probably both good enough though. Time will tell. I personally stay away from RP products, but that's just me based on some experience from some racing friends.
     
    Wallygator[QUOTED] likes this.
  25. Oct 13, 2022 at 10:28 AM
    #25
    Wallygator

    Wallygator Well Zippedy Da Do!

    Joined:
    Apr 7, 2020
    Member:
    #44761
    Messages:
    2,563
    Yeah I have never used any of their other products except for this one. Have not had an issue with the Synchromax over two vehicles now. An no clue about any of their other stuff
     
  26. Oct 13, 2022 at 12:28 PM
    #26
    Stumpjumper

    Stumpjumper New Member

    Joined:
    Sep 15, 2016
    Member:
    #4546
    Messages:
    3,323
    Gender:
    Male
    Fate, Tx
    Vehicle:
    2017 Tundra TSS 4x4
    I changed diff oil at 100k in my Fords if I kept them that long. No drain plugs so the only way to change was to pull the cover. I think Toyota is the only truck manufacturer that recommends changing at 30k. I dropped the pan and changed trans fluid every 30k on Fords.
     
  27. Oct 13, 2022 at 1:48 PM
    #27
    Sumo91

    Sumo91 Busy with projects

    Joined:
    Nov 16, 2019
    Member:
    #38726
    Messages:
    1,494
    Gender:
    Male
    TN
    Vehicle:
    2014 MGM Tundra Platinum 4x4
    Bilstein 8112/8100 3.25in lift Dobinson leaf springs 2.1in lift Level8 MK6 wheels Big ole dent in bedside
    I see you found my analysis. Fluid was still good. I have much better fluid in there now, HPL 75w, Dave made me a batch and didn't upcharge for it.

    I'm gonna be running my diffs at 100k intervals from now on, I will be draining my current fluid after 10k though since I just regeared to 5.29s.

    99% of people never change their diff fluid, and they do just fine, how many rear diff failures frem lubrication failures have you heard of? Any fluid change at any interval you want to do will be beneficial and prolong the life of the axle assembly. I had 59k miles on my last UOA, lots of offroad and towing, temps from -18F to 110F, and it came back great. Which is why I'll be doing 100k intervals with an even better fluid.

    If I didn't keep my vehicles forever, I'd run the cheapest fluid I could buy that meets spec. I buy great fluid thats above and beyond labeled specs, get an analysis on it, and go from there.

    Everyone is different and runs the brand of oil they prefer at the intervals they feel comfortable to with.
     
  28. Oct 14, 2022 at 5:32 AM
    #28
    Hugemoose

    Hugemoose New Member

    Joined:
    Oct 21, 2019
    Member:
    #37634
    Messages:
    496
    Gender:
    Male
    First Name:
    David
    Philly
    Vehicle:
    2016 Tundra Crewmax
    Not enough....
    Haha yes I did. I can see that some of the values are less than that of Toyota, but it was nice to see it at least held up with nearly 60k miles on it.

    And you are 100% right, most people never even change their fluids and failures are rare. I think the biggest concern here is the transfer case, not the diffs. Now if the Ravenol doesn't hold up or causes me some trouble using 4wd, I'll switch back to OEM fluid for that.

    I think the other big issue, at least for the T-case, is lack of options for straight 75W fluid. Front and rear diffs are easy, and I probably would have ran something else other than Ravenol if it hadn't been for that big combo package from Blauparts.
     
    Sumo91[QUOTED] likes this.
  29. Oct 27, 2022 at 1:06 PM
    #29
    awq735

    awq735 [OP] New Member

    Joined:
    Apr 8, 2019
    Member:
    #28824
    Messages:
    204
    Gender:
    Male
    First Name:
    Anthony
    Ohio
    Vehicle:
    2019 Tundra Sport, MGM
    This is what the local dealership sold me today for $10.59 a bottle. I'll be changing out the front and rear diff fluid this weekend. If the front diff oil looks clean I don't think I'm going to change the transfer case oil any time soon.

    Screenshot_20221027-152956.jpg
     
    WILLINH likes this.
  30. Oct 27, 2022 at 1:18 PM
    #30
    CTundraForMe

    CTundraForMe New Member

    Joined:
    May 26, 2021
    Member:
    #63550
    Messages:
    575
    Two thoughts:

    1 - if you're driving in deep water, get a breather kit. otherwise your diff will suck water. (the diff gets hot with use; when it hits cold water, it suddenly sucks in air ... or water if there's no air) I think it was $25 maybe? I put one on mine. When it rains here, it *really* rains.

    2 - complaining about Toyota tcase fluid price is a bit odd? I researched this when I bought my '15 used with 96k miles on it. I determined better to be safe than sorry. $100 more or something is nothing? That said I didn't understand why it came in a tin can that I had to puncture with an old fashioned can opener!!
     
To Top