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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. Jan 21, 2020 at 7:52 AM
    #5621
    jrshaw91450

    jrshaw91450 Well-Known Member

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    Great detail! Would he happen to have any suggestions on toning the noise down? i.e., thicker or different oil, ect...

    I said i would never lift another truck, but this noise is waring on my nerves. Aggressive tires and blocks seem to be the only thing killing it.
     
    Hot Taco sauce likes this.
  2. Jan 21, 2020 at 10:53 AM
    #5622
    AKGSD

    AKGSD Warranty denied

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    Blocks didn’t change mine. From what I’ve read, it’s leaf springs that do it. I’m still on stock tires
     
    TacoTim85 likes this.
  3. Jan 29, 2020 at 10:30 AM
    #5623
    ryan760

    ryan760 Well-Known Member

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    Thinking about trying this on the axle tubes (minus the pumpkin) and perhaps even on the leaf springs:

    https://www.amazon.com/Design-Engineering-050220-Deadening-Vibration/dp/B001URKV0G

    It's supposed to be made for automobile applications, and is black. My only concern would be preventing proper cooling of the differential and oil. I think the pumpkin needs to be kept bare metal to allow the oil to cool, so I wouldn't cover that.

    I figure spraying the axle tubes would be reasonably safe, as well as the leaf springs.

    The theory behind this idea is from a research paper on axle whine (https://journals.sagepub.com/doi/abs/10.1177/0954407011401302), as well as Toyotas TSB which implies that the noise is transmitted through the axle tubes through the leaf springs and frame, and into cab.

    What do you guys think?
     
    Pablo8 likes this.
  4. Jan 29, 2020 at 10:49 AM
    #5624
    Pablo8

    Pablo8 Juan Fresh Taco

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    I cannot imagine this working
    ..b..but worth a shot just to prove me wrong. Do it.
     
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  5. Jan 30, 2020 at 7:24 AM
    #5625
    dung

    dung Well-Known Member

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    It won't hold in enough heat to matter in the long run. I doubt it will work either, but it isn't going to hurt.
     
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  6. Jan 30, 2020 at 7:32 AM
    #5626
    ryan760

    ryan760 Well-Known Member

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    My other idea (I may try it first) is to get some weighted magnets off Amazon and place them in various areas on the axle, springs, and frame to see if the added mass changes anything.

    Need to figure out if the bulk of the noise is radiated straight from the pumpkin, or if its amplified through the springs, frame, and body. That's the first step to finding a solution I think.
     
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  7. Jan 30, 2020 at 2:52 PM
    #5627
    AKGSD

    AKGSD Warranty denied

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    Aren’t these things the engineers would have (theoretically) tried before telling all of us it’s “normal”?
     
    ryan760 likes this.
  8. Jan 30, 2020 at 3:22 PM
    #5628
    MannyS

    MannyS Well-Known Member

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    I did the following to attempt to reduce the rear end noise on a new ‘16 auto Sport 2WD during the first year of ownership and none of the actions remediated the problem.
    - dealer replaced entire rear end assembly. Same noise problem after 100 miles
    - dealer replaced driveshaft assembly, but no improvement
    - lube replaced multiple times with different synthetic brands (Mobil1/Amsoil/Valvoline/Toyota/Pennzoil/BG additive), but the noise would return within 100 miles

    Good news is that the ‘20 manual Pro and ‘20 auto Sport 2wd that I purchased have zero rear end noises after 4K miles of usage. Fingers crossed.
     
    Last edited: Jan 30, 2020
    nDub, CygnusX191 and AKGSD like this.
  9. Jan 30, 2020 at 3:59 PM
    #5629
    ryan760

    ryan760 Well-Known Member

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    Man I swear, I'm convinced the engineering department ran out of budget half way through the NVH process for the 3G taco. IMO, the noise is so blatant and in your face that its like they didn't even try, hence why I think they just didn't get around to addressing it, and pushed the truck to market as-is.

    Or they missed it during product testing, but I don't know how the hell you'd miss something like this.
     
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  10. Jan 30, 2020 at 4:45 PM
    #5630
    dung

    dung Well-Known Member

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    Well clearly the noise isn’t there. That is why they didn’t miss it :)
     
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  11. Jan 30, 2020 at 6:56 PM
    #5631
    jrshaw91450

    jrshaw91450 Well-Known Member

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    I just spent 2000+ miles behind the wheel of a 2020 GMC Canyon diesel (I was transporting it for a friend before anyone gets crazy) and I will say I didn’t realize the noise that gets through the back of the cab on my Tacoma until spending a substantial amount of time behind the wheel of that truck. Thing was so quiet inside and now being back in my 2019 Tacoma Im amazed on the noise coming through the back of the cab. I don’t understand why, it’s not like I noticed thicker seats or more insulation back there.

    I just stuffed some pipe insolation between a cab and bed to see if it dampens the noise at all. I imagine Toyota would have experimented with this already before issuing a much more expensive TSB to replace leaf springs, which did nothing on my 2017. Finger crossed, but almost certain it will change nothing.
     
    ryan760 likes this.
  12. Jan 30, 2020 at 7:11 PM
    #5632
    ryan760

    ryan760 Well-Known Member

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    I'm pretty satisfied with how quiet the cab is inside, except for the damn howl. It's like being stuck in a 1st world torture chamber at 55 mph.

    Interesting idea with the pipe insulation though. :thumbsup:
     
    Last edited: Jan 30, 2020
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  13. Jan 30, 2020 at 8:02 PM
    #5633
    jrshaw91450

    jrshaw91450 Well-Known Member

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    It is very quiet compared to the 2nd gens. The pipe insulation is something someone said worked pretty good a while back in this thread or another, I don’t remember, but its a cheap easy test. Sometimes Im exhausted from the issue but at the same time I cant believe Toyota would accept it, especially since the Tacoma legacy is built on quality and longevity. You would think after the first year they would have told Hino to redesign the DB22 differential or their going elsewhere.
     
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  14. Jan 30, 2020 at 8:15 PM
    #5634
    ryan760

    ryan760 Well-Known Member

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    If that pipe insulation idea works, that would be amazing. I'd be thrilled with even a 20% reduction... anything to take the edge off.
     
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  15. Jan 31, 2020 at 7:44 PM
    #5635
    TacoTim85

    TacoTim85 Typical stick shift owner

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    I'm so confused why you would buy TWO more new Tacomas after what sounds like a real headache, no pun intended (ok a little pun intended). Lol

    Wish I was lucky enough to buy a '20 without the howling! Although, mine isn't that bad compared to what some have described. :thumbsup:
     
    AKGSD likes this.
  16. Jan 31, 2020 at 8:53 PM
    #5636
    MannyS

    MannyS Well-Known Member

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    Good question. Buyback done for the ‘16. I am a Toyota guy, so Last month I bought me a 2WD Sport, bought my daughter a Pro manual and got my wife a Land Cruiser Heritage. All good.
     
  17. Jan 31, 2020 at 9:02 PM
    #5637
    jrshaw91450

    jrshaw91450 Well-Known Member

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    At no surprise the pipe insulation stuffed between the cabin and bed made no real difference. At least I can check that one off.
     
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  18. Feb 1, 2020 at 2:34 PM
    #5638
    TacoTim85

    TacoTim85 Typical stick shift owner

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    Nice. Not trying to be a dick, was actually just curious.

    The buyback was due to the rear end noise I assume? How many repair attempts needed in TX before lemon law?

    Glad your new ones are nice and quiet. I'm sure you're happy about that. I'm not brand loyal, but have always regarded Toyotas as great vehicles. Some of the best.
     
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  19. Feb 1, 2020 at 6:53 PM
    #5639
    MannyS

    MannyS Well-Known Member

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    - rear end noise
    - left stranded 4 times (2 CPS, 1 battery & alternator, radiator leak)
    - did not do lemon law. Negotiated my own car exit.
     
    CygnusX191 likes this.
  20. Feb 1, 2020 at 7:35 PM
    #5640
    TacoTim85

    TacoTim85 Typical stick shift owner

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    Damn, that's rough. Better luck with the new ones.
     
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