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

Do any of your SR model 8 inch rear diffs have the " howling " ?

Discussion in '3rd Gen. Tacomas (2016+)' started by Storman, Apr 6, 2017.

  1. Apr 6, 2017 at 6:30 AM
    #1
    Storman

    Storman [OP] Fukitol abuser

    Joined:
    Dec 12, 2016
    Member:
    #204700
    Messages:
    959
    Gender:
    Male
    South Western PA
    Vehicle:
    2017 SR AC 4x4 AT AC UP ->LONG BED<-
    Whole bunch of shit! $$$
    Tacoma trucks are fitted with one of two rear drum-braked axles depending on configuration. The BD20 axle has an 8-inch ring gear and this axle is basically carryover from the previous truck, but it does have some changes including a new gearset. (This is what I have)


    There’s also a brand-new rear axle with 8.75-inch ring gear and high-strength axletubes. The BD22A is the “normal” 8.75-inch axle and the BD22AN 8.75-inch axle is fitted with an electric rear locker.

    The BD22AN will be included in TRD Off-Road package-equipped trucks.

    These new 8.75-inch axles contribute to a gross axle weight rating improvement of 24 percent. It’s also worth noting that the electronic rear diff locker now has an internally-mounted drive motor as opposed to the external motor found on the previous Tacoma. (These are the ones prone to the "howling")


    If you could please state your model, year, and what rear end you have,your mileage, auto or manual trans and if you have the "howl".

    My hope is Toyota at least addresses the problem for the guys/gals with the 8.75 diff howl.


    Me:
    2017 SR Utility AT @ 4k miles
    8 inch rear end
    NO HOWL
     
    Paul631 and shakerhood like this.
  2. Apr 6, 2017 at 7:36 AM
    #2
    bobrown14

    bobrown14 Well-Known Member

    Joined:
    Oct 3, 2015
    Member:
    #165752
    Messages:
    4,475
    Gender:
    Male
    First Name:
    Bob
    Philadelphia
    Vehicle:
    Gen 3
    bunch of stuff - Bro Pro style
    The 8.75" rears come with the Pro model and the Limited model and also on any truck with a 6speed manual tranny.

    TRD Sport with the 8.75 rear - no howl that I can hear...I have larger tires so at 55 or so when the rear might be howling, my tires are probably louder.

    20K miles and trouble free.. only problem I have is getting the dealership to lube my truck when I take it in for service. They think all the Gen3s have sealed zirks.
     
    shakerhood and Storman [OP] like this.
  3. Apr 6, 2017 at 8:11 AM
    #3
    Storman

    Storman [OP] Fukitol abuser

    Joined:
    Dec 12, 2016
    Member:
    #204700
    Messages:
    959
    Gender:
    Male
    South Western PA
    Vehicle:
    2017 SR AC 4x4 AT AC UP ->LONG BED<-
    Whole bunch of shit! $$$
    I hqve not had 1 single problem with mine yet either, really liking this truck.
     
    bobrown14 and shakerhood like this.
  4. Aug 10, 2017 at 11:27 AM
    #4
    7r41lbr34k3r

    7r41lbr34k3r @gmail

    Joined:
    Sep 6, 2016
    Member:
    #196549
    Messages:
    2,841
    Gender:
    Male
    First Name:
    Rick
    Upper Perkiomen Valley, PA
    Vehicle:
    '17 SR w/ Conv. Pkg 2TR-FE 5MT 4x4 MGM
    Me:
    2017 SR w/convenience MT @ 34k miles
    8.75 inch rear end
    NO HOWL

    It is weeping/leaking, though.
     
  5. Aug 10, 2017 at 3:19 PM
    #5
    NJTaco08088

    NJTaco08088 Well-Known Member

    Joined:
    Jul 16, 2017
    Member:
    #224154
    Messages:
    59
    Gender:
    Male
    Vehicle:
    2017 DCLB SR5 4x4
    2017 sr5 DCLB. Both 1st and 2nd rear diffs howl. Really annoying. Stay away from these trucks. Every truck on the dealer's lot does it.
     
  6. Aug 10, 2017 at 4:46 PM
    #6
    Hiluxski

    Hiluxski Well-Known Member

    Joined:
    May 20, 2015
    Member:
    #155659
    Messages:
    1,059

    Your rear end is not a carryover. the previous Tacoma (2nd gen) has an 8.4 inch rear end and is completely different and shares nothing with 3nd gen. Your new 8" is similar to the early (pre 95) Toyota trucks 8 " V6 except it has larger ring gear bolts.
     
  7. Aug 10, 2017 at 4:53 PM
    #7
    rjacobs

    rjacobs Well-Known Member

    Joined:
    Jun 6, 2017
    Member:
    #220901
    Messages:
    101
    Gender:
    Male
    17 DCSB SR5 so 8" rear end.

    1500 miles

    No howl.

    I just changed the diff fluid today to Amsoil 75w90 Severe Gear. The factory fill was pretty nasty for 1500 miles. The magnetic drain plug had lots of fuzz on it, but nothing I would consider bad.

    Getting lots of fine particles in gear oil will erode the face of the gears and then you lose tolerances and the gears will whine. Usually that happens after 10's to 100's of thousands of miles on gear lube by people who never change it, but who knows, might be happening on some trucks very early in their lives.
     
  8. Aug 10, 2017 at 5:03 PM
    #8
    hiPSI

    hiPSI Laminar Flow

    Joined:
    May 21, 2017
    Member:
    #219544
    Messages:
    7,260
    Gender:
    Male
    South Carolina
    Vehicle:
    2019 Toyota Tundra 4WD Crew Cab 5.7L Limited with TRD Off Road Package and Cement
    8.75 manual TRD sport. No howl or any other problem at 8K miles.
     
  9. Aug 10, 2017 at 5:33 PM
    #9
    Claudiomartinof

    Claudiomartinof Well-Known Member

    Joined:
    Apr 18, 2016
    Member:
    #184668
    Messages:
    1,116
    Gender:
    Male
    Vehicle:
    2019 TRD OFF ROAD 6MT
    25k on my sr no howl.
     

Products Discussed in

To Top