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"Normal" 3rd gen manual trans noise fix

Discussion in '3rd Gen. Tacomas (2016+)' started by DeeKay20, Nov 7, 2020.

  1. Nov 7, 2020 at 5:36 PM
    #1
    DeeKay20

    DeeKay20 [OP] Well-Known Member

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    Not sure if this has been covered before, but I came up with sort of a fix, well not so much a fix but more of an improvement to remedy some of the awful sounds that the 6MT makes. For anyone not aware, the 6MT makes some noise when driving over bumps in neutral or with the clutch in; kinda sounds like banging two frying pans together. The dealer will tell you it's a "normal" noise along with some people on this forum who will say "it's a truck, It drives and sounds like a truck" Which is crazy talk to me, I think these "trucks" drive like Cadillac's compared to most pickups.
    "Normal" is fine and all, but I still hate it.... Just my opinion but this brand new truck shouldn't make more noise than my '86 F350 did.
    Anyway, I found that the heat shield for the accumulator and slave cylinder causes some resonance with the transmission resulting in that sound of banging pans together. Obviously Toyota put the shield there for a reason so we can't just eliminate it all together. The fix is simple though; isolate and dampen the connection between the shield and the trans.

    I used some BUNA-N gasket material I had and a gasket punch to make some rubber washers. Any medium-hard durometer rubber would be fine, the stuff I used is 60A on the hardness scale. Or buy some 1/8" thick 5/16"ish ID 3/4"ish OD rubber washers.

    Basically all I did was sandwich a rubber washer between the bolt head and the heat shield and then another one between the heat shield and the tranny. I then put some purple locktite on the bolts and snugged them up, blue loctite is fine too. Don't go too tight, we want the rubber to do most of the work holding the heat shield tight. I only did three of the four mounting points and it seemed to do the trick for me. This won't get rid of all the noises from the trans, just the metallic pots and pans noises. Enjoy your somewhat quieter Tacoma.


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    Last edited: Nov 7, 2020
  2. Nov 7, 2020 at 5:43 PM
    #2
    Plain Jane Taco

    Plain Jane Taco I have become comfortably numb

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    Nice job. I wonder if applying some heat shielding material would do the same thing? I've seen it at auto parts stores. Amazon sells it by the roll. Similar to sound deadening material....but meant to reflect heating.

    https://www.amazon.com/Design-Engineering-010394-High-Temperature-Reflective/dp/B0039Z5TUY

    It's probably more to protect that area from anything the spinning drives haft might throw at it than heat
     
    DeeKay20 [OP] likes this.
  3. Nov 7, 2020 at 5:48 PM
    #3
    DeeKay20

    DeeKay20 [OP] Well-Known Member

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    I bet it would, I was originally going to just dynamat the back side of it but had the rubber stuff on hand so I though I'd try it like this. The way Toyota stamped that shield makes it act like a bell so anything that would dampen the vibes from it would work fine.
     
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  4. Nov 7, 2020 at 6:15 PM
    #4
    Jowett

    Jowett Well-Known Member

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    Nice find and solution.
     
  5. Nov 7, 2020 at 6:24 PM
    #5
    b3itz

    b3itz Well-Known Member

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    Hmmmm good find. I might check this out. Thanks!
     
  6. Nov 7, 2020 at 6:34 PM
    #6
    TurdTaco64

    TurdTaco64 Well-Known Member

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    Oh boy am I excited to try this one out!
     
  7. Nov 7, 2020 at 6:42 PM
    #7
    DeeKay20

    DeeKay20 [OP] Well-Known Member

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    ret42 likes this.
  8. Nov 7, 2020 at 7:00 PM
    #8
    ShirtTucker

    ShirtTucker Un-Known Member

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    If this actually gets rid of the noise, I'll buy you a beer.

    Some guys have left that heat shield off after the ADM. I'd like to hear from them to verify that they no longer have the noise.
     
    DeeKay20 [OP] and b3itz like this.
  9. Nov 24, 2020 at 12:33 AM
    #9
    b3itz

    b3itz Well-Known Member

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    Has anyone else attempted this?
     
  10. Nov 24, 2020 at 1:09 AM
    #10
    RedWings44

    RedWings44 Well-Known Member

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    If it's the heat shield, why is the noise only occurring in the specific situation you mentioned (neutral with the clutch pressed)? Genuinely curious
     
  11. Nov 24, 2020 at 9:24 AM
    #11
    DeeKay20

    DeeKay20 [OP] Well-Known Member

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    The Heat/debris shield itself isn't making the noise, it's just amplifying it. Basically the normal internal noises from the trans is resonating through that sheet metal and making it louder/more metallic sounding.
     
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  12. Nov 24, 2020 at 9:28 AM
    #12
    tonered

    tonered tacorider

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    I believe there is a TSB or something for this. It might have been noted in the ADM thread? We were trying to figure out why it was done. This reason might be it?
     
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  13. Nov 24, 2020 at 9:39 AM
    #13
    tonered

    tonered tacorider

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    It looks like @ShirtTucker mentioned it, but I am recalling different post?
     
  14. Nov 24, 2020 at 9:50 AM
    #14
    jmneill

    jmneill Well-Known Member

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    They do, and yes, they are. :thumbsup:
     
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  15. Nov 24, 2020 at 11:34 AM
    #15
    RedWings44

    RedWings44 Well-Known Member

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    Makes sense
     
  16. Nov 29, 2020 at 5:01 AM
    #16
    SilverSkyTRD

    SilverSkyTRD Well-Known Member

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    Thanks OP for this helpful post. Anyone else try it yet? I just picked up (yesterday) a new MT sport. I could hear what sounded like a heat shield noise, especially just before shifting into 2nd, on my drive home. I'm glad I found this post.
     
    demiTacoma likes this.

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