1. Welcome to Tacoma World!

    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 Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Low Rear Diff fluid symptoms?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by lordviews, Dec 26, 2022.

  1. Dec 26, 2022 at 7:16 PM
    #21
    TnShooter

    TnShooter The TacomaWorld Stray

    Joined:
    Sep 2, 2010
    Member:
    #42625
    Messages:
    18,485
    Gender:
    Male
    First Name:
    Deogee
    Vehicle:
    07' TRD Off-Road, Auto
    STOCK
    You want to know what’s weird?
    Valvoline 75w-90 is synthetic based.
    Yet 80w-90 is NOT synthetic based.

    There has been numerous reports of synthetic base gear oil causing chatter in the mechanical LSD trucks.
    My vote is, use 80w-90 and run an LSD additive.

    Will it hurt it?
    Nope, not at all.

    Go read your owners manual, it never calls for 75w-90 in the rear differential.
    It says, 90w, 80w or 80w-90.
     
    Last edited: Dec 26, 2022
    Leomania and b_r_o like this.
  2. Dec 27, 2022 at 9:11 AM
    #22
    asuchemist

    asuchemist My Hamstrings Hurt!

    Joined:
    Mar 29, 2013
    Member:
    #100895
    Messages:
    2,001
    Gender:
    Male
    South South Dirty Gilbert
    Vehicle:
    11' TRD Sport V6, 23' TRD Pro 4Runner, 23' Tacoma TRD Pro
    NONE
  3. Dec 27, 2022 at 9:48 AM
    #23
    TnShooter

    TnShooter The TacomaWorld Stray

    Joined:
    Sep 2, 2010
    Member:
    #42625
    Messages:
    18,485
    Gender:
    Male
    First Name:
    Deogee
    Vehicle:
    07' TRD Off-Road, Auto
    STOCK
    Friction modifiers won’t hurt an open differential. They won’t help either.
    But if you add it to all the fluid, you can never make the mistake of not using it if need.

    I think the dealership does it as a safety measure.
     
  4. Dec 27, 2022 at 11:32 AM
    #24
    Chuy

    Chuy Well-Known Member

    Joined:
    Aug 4, 2008
    Member:
    #8328
    Messages:
    3,591
    Gender:
    Male
    Lakeside, CA
    Vehicle:
    07 V6 DCLB 4X4 Sport
    Silver Taco
    To emphasize the point, only mechanical LSD units require the LSD modifiers. Mechanical LSD’s in second gen Tacomas were installed in certain 05-08 models. It came standard on Sport models. I don't recall if it was an option on non-Sport models. I am curious, do rear lock diffs require the modifiers?
     
    TnShooter likes this.
  5. Dec 27, 2022 at 11:58 AM
    #25
    TnShooter

    TnShooter The TacomaWorld Stray

    Joined:
    Sep 2, 2010
    Member:
    #42625
    Messages:
    18,485
    Gender:
    Male
    First Name:
    Deogee
    Vehicle:
    07' TRD Off-Road, Auto
    STOCK
    No, the locker does not require modifiers.
    It’s fully open until locked. And it’s physically locked. Modifiers have no bearing on the locking system.
     
    Chuy[QUOTED] likes this.
  6. Dec 27, 2022 at 2:43 PM
    #26
    lordviews

    lordviews [OP] Well-Known Member

    Joined:
    Sep 30, 2022
    Member:
    #406994
    Messages:
    57
    Gender:
    Male
    07 TRD Sport
    Just purchased some today. Do you think I can just add it to what I just put in? I just replaced it not too long ago and really don’t want to drain it again and buy it all over again if I don’t have to
     
  7. Dec 27, 2022 at 3:00 PM
    #27
    asuchemist

    asuchemist My Hamstrings Hurt!

    Joined:
    Mar 29, 2013
    Member:
    #100895
    Messages:
    2,001
    Gender:
    Male
    South South Dirty Gilbert
    Vehicle:
    11' TRD Sport V6, 23' TRD Pro 4Runner, 23' Tacoma TRD Pro
    NONE
    Yes, you should be able to add it in. You shouldn’t have to drain it.

    You might have to suck a little diff fluid out if you filled it correctly.
     
    TnShooter likes this.
  8. Dec 27, 2022 at 4:09 PM
    #28
    sparkystaco

    sparkystaco Well-Known Member

    Joined:
    Jan 26, 2010
    Member:
    #30122
    Messages:
    4,815
    Gender:
    Male
    First Name:
    Sparky
    SE Wi
    Vehicle:
    06 4x4 dc trd ofrd
    3" lift? A.R.E cap 285/70/17 moto metal 955 17x9
    Once you add the friction modifer find a open lot and do about ten figure eights to work it into the plates
     
    asuchemist likes this.
  9. Dec 27, 2022 at 4:19 PM
    #29
    Clearwater Bill

    Clearwater Bill Never answer an anonymous letter

    Joined:
    Oct 11, 2014
    Member:
    #140097
    Messages:
    23,057
    Gender:
    Male
    First Name:
    Billy
    Largo Florida
    Vehicle:
    '13 5 lug AC w/convenience package
    A few OE parts from fancy trucks
    And was the truck level, side to side and front to rear. If not any checking is less than accurate.

    If nose down or off side to side you can add too much. If nose too high you can't get enough in.
     
    Squirt[QUOTED] likes this.
  10. Dec 27, 2022 at 4:57 PM
    #30
    Williston

    Williston Well-Known Member

    Joined:
    Aug 21, 2021
    Member:
    #374833
    Messages:
    1,816
    Gender:
    Male
    New England
    Vehicle:
    2014 Tacoma V6 AT SR5 4x4 DC SB Tow Pkg Entune+
    Super White Stock (99.999%) OEM Bed Floor Mat, Cargo Net, Auto-Dim mirror w/Compass and outside Temperature display, TRD Pro Grille, Uni-Filter air pump modification, WeatherTech floor liners f/r.
    Let's assume the Valvoline fluid you used is the best you can buy with all the additives you need: That said: There are no symptoms until it whines, howls and fails.... (you'll know) Remove the filler plug on a level area when it's cool, and see if you get a steady stream out of the opening. If you don't: it's not full. Add fluid accordingly.
     
    Last edited: Dec 28, 2022
  11. Dec 27, 2022 at 8:08 PM
    #31
    JdevTac

    JdevTac Hawk Tuah ‘24

    Joined:
    Jan 8, 2012
    Member:
    #70234
    Messages:
    6,072
    Gender:
    Male
    First Name:
    Josh
    GA/WA
    Vehicle:
    2nd gen
    Thinking broadly and with the cold weather, do you use your parking brake often? If so, maybe it’s sticking.
     
    Smokestacks likes this.
  12. Dec 28, 2022 at 4:27 PM
    #32
    lordviews

    lordviews [OP] Well-Known Member

    Joined:
    Sep 30, 2022
    Member:
    #406994
    Messages:
    57
    Gender:
    Male
    07 TRD Sport
    So I just added it today and I am stoked. Drove it around and it was a night and day difference. It no longer does anything and drives beautifully. Idk if it’s placebo but the vibrations are definitely gone. Thank you and everyone for the input. I really appreciate it!
     

Products Discussed in

To Top