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3rd Gen Poll: Rear End Noise howling when feathering throttle

Discussion in '3rd Gen. Tacomas (2016+)' started by smitty99, Jul 21, 2016.

?

Does your rear end make a slight howling noise at 50-65mph when feathering throttle?

  1. Yes

  2. No

  3. Have not checked it yet but will report back

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  1. Jun 5, 2020 at 8:09 AM
    #6061
    ericf

    ericf Well-Known Member

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    The toyo customer care "specialist" contacted me this morning to follow up on my complaints / issue. She said she was going to contact dealer and ask about them "taking me for a ride" in another 2020 OR to demonstrate that this is indeed a "normal" occurrence as the dealer informed me. I'm sure the dealer/toyo will absolutely find one on their lot that does exhibit this noise so they can can "see, they all do it". If they pull that, I'm going to point randomly to a different one and ask to ride in that one.
     
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  2. Jun 5, 2020 at 9:18 AM
    #6062
    ryan760

    ryan760 Well-Known Member

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    The problem is that the howl usually develops after the diff breaks in (few hundred to a few thousand miles). I would refer the customer service person to this thread and be sure to make a point that the noise takes time to develop.

    I'm still thinking the gear mesh vibrations are creating a tuning fork effect with the axle tubes, springs, and/or frame...

     
    Last edited: Jun 5, 2020
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  3. Jun 5, 2020 at 9:41 AM
    #6063
    ShimStack

    ShimStack Well-Known Member

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    Are you asking about spider to side gear backlash? Won't do a thing as they aren't rotating relative to each other when the whine is occurring.

    I was just explaining that yes, Toyota does set up gears to spec and they even set up to more specs than a typical gear shop checks.
     
  4. Jun 5, 2020 at 10:22 AM
    #6064
    ericf

    ericf Well-Known Member

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    Shimstack, How do I approach Toyota to get them to check into this and open it up for actual examiniation? I'd prefer they not
    1) tell me again, "this is a normal whine, get used to it" , "even the new Tundras are doing this"
    2) simply replace the rear axle with a unit that possibly exhibits the same quality whine and or a rebuilt unit that still has this wonderful sound effect as others have posted about.

    I'd actually prefer they rebuild / repair or replace the parts that are creating the whining sounds and get it set up correctly (assuming it's not quite right). Some here on this forum are stating that this whine is normal and doesn't create a detriment. Ok, probably correct on the "no failure" possibility. But if it was "normal", 100% of the tacomas would exhibit this "effect". However, I've not ridden in a tacoma that exhibited this whining phenomenon, 2nd or 3rd gen.
    I owned a second gen 2wd for 120k miles, my son has a second gen 4x4 (117k miles) , Nephew has 3rd gen TRD 4x4, neighbor has 3rd gen limited 2wd, A close friend has 2019 sr5 4x4, and I've ridden in others, both 4x4, 4x4OR and 2wd that don't have this annoying quality. So I guess I'm just extremely lucky to get such a fine example.
    My dealer tells me things that aren't true. Such as "yes, we checked all the fluids and they are fine" . I posted what I found when I checked.
    Hopefully, if Toyo decides to help with this, I can go to a different dealership. Ive grown to distrust my closest one.
     
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  5. Jun 5, 2020 at 11:03 AM
    #6065
    ryan760

    ryan760 Well-Known Member

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    You should contact East Coast Gear Supply and ask them if they think you should bother getting It looked at. They are a pretty honest business and didn’t try to sell me on anything when I asked. They were extremely familiar with the noise issue on the 3rd gen Tacoma’s. They specifically said it wasn’t a setup issue, and that changing gears won’t help.

    There’s even a tech note on their page for the 8.75” rear end

    https://eastcoastgearsupply.com/i-23993416-8-75-tacoma-elocker-third.html
     
  6. Jun 5, 2020 at 11:14 AM
    #6066
    hpiguy

    hpiguy Well-Known Member

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    Ha! Thought this was wind noise, I have the same thing on my 2020 TRD Pro, 3000 miles on it. Now I know where it's from. Has done it since day one.

    Also noticing a loud whine noise from the back, sounds like a fuel pump in overdrive, but only when the truck is moving above 20mph, so it's not the fuel pump.
    The whine gets louder as the truck gets warmer from driving, so loud people on the sidewalk look towards the truck like "WTF is that noise?" As if I'm driving a beat up 1991 F150.

    Some serious lack of quality control 'Yota has these days.... rattles, hums, vibrations.
    My FJ was rock solid, quiet and smooth.

    Wish they'd go back to making all their vehicles in Japan.
     
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  7. Jun 5, 2020 at 11:21 AM
    #6067
    zoo truck

    zoo truck Well-Known Member

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    Can't complain my 2020 was made in teaxa's, its every bit as quiet as the indiana built tundra i owned. Really the only thing i can pick on is the seat belt buckle rattles against the door pillar if not buckled.
     
  8. Jun 5, 2020 at 11:24 AM
    #6068
    ShimStack

    ShimStack Well-Known Member

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    Again, looking at this as a differential problem will not produce results because there's nothing wrong with an axle strictly because it whines. Gears whine, these axles whine, it's just part of the physics. Where the issue lies is in the nvh. There was not appropriate attention paid to attenuating the frequencies associated with the gear noise around 60 mph. That's why suspension changes and stuff can randomly fix it as it changes the frequency ratio of the system. The classic fix for something like this is some adjustment to the properties of the system being excited (suspension, frame, body) and not the source (gears, axle).

    If the driveline/gears generated a felt vibration then you would go to the source, but since it's acoustic you can just go to what's being excited.

    An nvh study would be a bit of trouble but would probably identify a few fixes.
     
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  9. Jun 6, 2020 at 5:55 PM
    #6069
    ericf

    ericf Well-Known Member

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    "h" must be harmonics, but the nv has me lost.
    Is there anyway, has anyone tried to isolate the rear drive train from truck? The Axle only has two points of contacts that I can think of (without looking again). maybe adding an extremely dense rubber (industrial flange gasket?) material in the leaf spring stack? Sorry, Just thinking of "what if's". may have been attempted.
     
  10. Jun 6, 2020 at 6:27 PM
    #6070
    ShimStack

    ShimStack Well-Known Member

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    Noise, vibration, and harshness. It's basically its own branch of automotive engineering.
     
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  11. Jun 8, 2020 at 8:16 PM
    #6071
    jrshaw91450

    jrshaw91450 Well-Known Member

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    Well back to 75-90 Amsoil severe gear. Took for a spin and seemed noisier, but I think its just f***ing with my nerves now. Considering buying the TSB body mounts but they are expensive and probably wont make any difference. Almost lost my shit and traded in for a GMC Canyon today! Was so quiet at all speeds. The amount of time I have spent fucking with this fucking noise is starting to pile up. Several types of oil, noico on back cab wall and fluid film on the leaf springs has also started to financially pile up. All this fucking time and money for no change. Its a NVH Toyota fuckup they need to fix and stop with the “its norma” BULLSHIT!!!! :frusty::frusty::frusty: Maybe they should send a truck to Ford Dodge or GM and fix the problem they cant seem to.

    Please god let someone figure out this noise issue! ​
     
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  12. Jun 8, 2020 at 11:04 PM
    #6072
    NMTrailRider

    NMTrailRider Well-Known Member

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    I feel for ya, man. I was in the same boat. After doing the back and forth with corporate on about 30 phone calls over 40 hours I finally traded off the truck. Couldn’t take it anymore. Lost money but regained my sanity. Got a 4runner instead. Because Toyota’s are mostly good trucks.
     
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  13. Jun 9, 2020 at 6:23 AM
    #6073
    zoo truck

    zoo truck Well-Known Member

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    All toyota needs to do is look at the tacomas that don't howl, and compare specs to the ones that do. They should find the difference in the ones howling? Imo it shouldn't take a rocket scientist to figure it out....or maybe they already know.
     
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  14. Jun 10, 2020 at 9:41 AM
    #6074
    ericf

    ericf Well-Known Member

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    Well, toyota just called me back (again).
    Rep said to go to dealership to test drive another "like" vehicle to demonstrate "whine" is normal. This really doesnt satisfy the fact that it isnt normal (I corrected her) , only that it is a reoccuring issue and needs to be addressed. I further told her that normalcy entails 100%, all like models will have this whine. Which obviously they dont. She became slightly belligerent and started telling me she is not a tech. And for me to not interrupt her.
    Disappointed is an understatement.
    I did call east coast gear. Talked with a nice young man for 20 minutes. He suggested trying a conventional heavier gear oil. Non synthetic. No guarantees.
    now have concluded that for distant trips i need more comfy headphones or ear plugs.
    I wont blast the truck. I do like it. This issue just makes one upset. Its been ongoing for years now and toyota seems to not care. And they sure dont tell you about it before the purchase. Would be nice to have had a disclosure.
     
  15. Jun 10, 2020 at 10:40 AM
    #6075
    jrshaw91450

    jrshaw91450 Well-Known Member

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    I just tried 85/140 non synthetic. Didn’t really make much difference. I have also tried new differential, foam between the bed and cab, multiple oil weights, Stuck noise dampener on back of cab and fluid film on leaf springs. Still screaming between 50 and 60. It drives me batshit crazy.
     
  16. Jun 10, 2020 at 11:27 AM
    #6076
    zoo truck

    zoo truck Well-Known Member

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    Starting to wonder if this howling is a wind issue though or over some part of the truck. I just returned from a fishing trip, but was talking with another 2018 sr dd cab tacoma owner with an auto v6 that claimed they can get their truck to make a singing sound if the hold the speed to precisely 55 mph. Anything above or below it goes away. They said they just avoid that speed and all is great.
    On another note at 2500 miles now, i think the seat in my cab is getting broken or the truck suspension is beginning to ride smoother. Engine/transmission now even towing is working better then i could ever hope for. Getting to really like this truck more and more.
     
  17. Jun 10, 2020 at 11:36 AM
    #6077
    AKGSD

    AKGSD Warranty denied

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    I wonder if you spoke with the same bitch i did... i should have saved that righteous anger for the engineer
     
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  18. Jun 12, 2020 at 8:07 AM
    #6078
    jrshaw91450

    jrshaw91450 Well-Known Member

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    Did someone on the thread say they installed blocks and still had the howling? Im now looking into a 2/1 bilstein 5100 lift with 265/75/16 tires?
     
  19. Jun 12, 2020 at 8:29 AM
    #6079
    zoo truck

    zoo truck Well-Known Member

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    Got a question...are the ones even with a tonneau cover howling to?
     
  20. Jun 12, 2020 at 1:01 PM
    #6080
    AKGSD

    AKGSD Warranty denied

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    I have a 2.5” block, no difference, still howls. Someone reported an icon AAL fixing it, maybe try that
    Sure are. Tonneau makes no difference
     

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