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Rear Diff Whine

Discussion in '1st Gen Tundras (2000-2006)' started by bmwahba, Dec 31, 2021.

  1. Dec 31, 2021 at 4:14 AM
    #1
    bmwahba

    bmwahba [OP] New Member

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    My rear diff is making some gear whine and was wondering if theres a recommended fluid I could put in there that is heavier than the DINO 90 that's recommended in the manual to quiet it down.

    Otherwise, does anyone have a good and used 3.91 rear LSD for 06 double cab that I could buy? I need to get rid of this noise! Driving me crazy!

    I'm in Central Florida in case anyone has a rear diff they could sell me.
     
  2. Dec 31, 2021 at 5:23 AM
    #2
    des2mtn

    des2mtn Too full to swallow my pride

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  3. Dec 31, 2021 at 5:29 AM
    #3
    bmc02

    bmc02 New Member

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    Have you tried changing fluid to see if it helps? Sure fluid level is correct? A full synthetic change with the LSD additives would be place to start.
     
  4. Dec 31, 2021 at 5:58 AM
    #4
    w666

    w666 D. None of the above

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    So you run this without adding friction modifier? I recently changed my oil from whatever was in it when I bought the truck to Mobil 1 75W-90 with LSD (I have the factory 3.91 LSD rear). Now I'm noticing a crunching/grinding sound sometimes when I accelerate hard from a stop while turning (like at a stoplight, let's say). I am hearing that our Tundras don't like synthetic gear lube, although I have run it in my Land Cruiser and 4Runner for years without complaint. I guess I'll give it a try!
     
  5. Dec 31, 2021 at 6:05 AM
    #5
    des2mtn

    des2mtn Too full to swallow my pride

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    Yes, I've drain and filled my rear diff twice with this, no extra modifiers (I have a factory 4.10 LSD). Truck hasn't complained at all -- no whining, grinding, etc.
     
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  6. Dec 31, 2021 at 6:10 AM
    #6
    bmc02

    bmc02 New Member

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    I've used redline full synthetic for years and no issues. Has the friction modifier for LSD in it, so no additional additives needed
     
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  7. Dec 31, 2021 at 8:39 AM
    #7
    bmwahba

    bmwahba [OP] New Member

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    Just swapped the fluid out with the Lucas 80-90, and still same noise. When pulling the drain plug, there were some accumulated metal shavings. Little bit of thicker sludge in the oil it seemed. But the sound remains.... so i need some help.

    I am curious if it could be anything else? It's definitely gear related, as I can hear it when the truck downshifts for example it picks up speed/frequency in noise.

    It is most prevalent at 50-60mph, then after 60mph it quiets down.

    Not sure if the transfer case or the front diff would be making this whine while it's being driven normally in 2wd.
     
  8. Dec 31, 2021 at 8:59 AM
    #8
    des2mtn

    des2mtn Too full to swallow my pride

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    Does the noise disappear when it's in 4WD? If that's the case, it could indicate that the needle bearing on the driver's side of the front differential is worn out.

    There's a dedicated thread on that needle bearing and an upgrade for it. Others have reported driveline voodoo that goes away in 4WD... https://www.tundras.com/threads/ecgs-bushing-tool.59664/#post-1563580

    Regarding sludge and oil shavings, the drain plug has a magnet on it so stuff accumulating is by design. Here's what mine looked like when I DIY'ed at 150K, dealer had done it previously at 75K.

    Tun (11).jpg
     
  9. Dec 31, 2021 at 9:01 AM
    #9
    bmwahba

    bmwahba [OP] New Member

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    It's in 2wd mode doing the whine. Not 4wd dependent.
     
  10. Dec 31, 2021 at 9:04 AM
    #10
    des2mtn

    des2mtn Too full to swallow my pride

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    If you can't recreate the whine while in 4WD then I'd wager it's the needle bearing.
     
  11. Dec 31, 2021 at 9:10 AM
    #11
    bmwahba

    bmwahba [OP] New Member

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    Shoot let me give that a try today....standby..
     
  12. Jan 1, 2022 at 8:54 AM
    #12
    bmwahba

    bmwahba [OP] New Member

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    Ok... sound is the same in 4wd as it is in 2wd.....
     
  13. Jan 1, 2022 at 12:41 PM
    #13
    bmwahba

    bmwahba [OP] New Member

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    Anyone parting a 4wd DC that I could steal a diff off of? This sucks!
     
  14. Jan 4, 2022 at 3:23 AM
    #14
    bmwahba

    bmwahba [OP] New Member

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  15. Jan 4, 2022 at 3:47 AM
    #15
    w666

    w666 D. None of the above

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  16. Jan 4, 2022 at 3:58 AM
    #16
    bmwahba

    bmwahba [OP] New Member

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    Yeah or core charge for +600 but not sure if it’s LSD or not, doesn’t really specify. I’ll call and check
     
  17. Jan 4, 2022 at 4:03 AM
    #17
    w666

    w666 D. None of the above

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    There's another thread on here somewhere that describes the different types LSDs, Lockers, eLockers, et al. I didn't really take the time to digest it all because my tiny brain is already pretty full. I only made a mental note for future reference...when my time comes I'll want to replace it with stock.
     
    Last edited: Mar 20, 2023
  18. Jan 4, 2022 at 7:43 AM
    #18
    bmwahba

    bmwahba [OP] New Member

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    Ok, called them up. For the base $750 price it's basically just an open diff.
    Now I need to decide if I want to spend the extra $500 for the TrueTrack upgrade....pretty spendy now.

    My ideal would be to find a verified good working order used diff for now! Anyone got any leads on a part out anywhere that would work for me?
     
  19. Jan 4, 2022 at 9:03 AM
    #19
    w666

    w666 D. None of the above

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    Did you ask how much/how long to rebuild yours?
     
  20. Jan 4, 2022 at 9:06 AM
    #20
    bmwahba

    bmwahba [OP] New Member

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    Yep, $1300 for the local shop to rebuild.
     
  21. Jan 7, 2022 at 7:07 PM
    #21
    shoe07

    shoe07 New Member

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    I used that Mobil 1 and continued to have the shudder from stop. I added two tubes of friction modifier over 12000 miles. Shudder from stop started again 2500after the second change. Recently changed to amsoil fluid. So far it’s been great, but quite spendy. I tow a ton though so probably a harsher use case than most.
     
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  22. Jan 7, 2022 at 7:19 PM
    #22
    FrenchToasty

    FrenchToasty The Desert rat, 6 lug enthusiast

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    I though double cabs all had the 3.91 gears? Maybe I’m mistaken
     
  23. Jan 7, 2022 at 7:24 PM
    #23
    KNABORES

    KNABORES Sarcasm incoming

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    he’s got that O4. Insert unicorn emoji
     
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  24. Jan 7, 2022 at 7:30 PM
    #24
    FrenchToasty

    FrenchToasty The Desert rat, 6 lug enthusiast

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    I was testing you…… hahah thanks
     
  25. Jan 7, 2022 at 7:46 PM
    #25
    KNABORES

    KNABORES Sarcasm incoming

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    no worries, I made the opposite mistake in another thread thinking they all had 4.10’s. But see, I’m learning!
     
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  26. Jan 7, 2022 at 8:29 PM
    #26
    Dalandshark

    Dalandshark Infected with 5G

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    And it’s not a wheel bearing?
     

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