Metallic raspy rattling sound when accelerating hard above 4000k rpm

Discussion in 'Shelby GT350 Mustang' started by MustangNY, Aug 1, 2018.

  1. Competition Orange

    Competition Orange Well-Known Member

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    My dealer shimmed it, came back a few days later. I'm requesting they replace it. My appointment is now tomorrow, not today.
     
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  2. Zeromaz

    Zeromaz Member

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    I’m an audio science guy and i believe the reason this happens is because of the RPM range is at the plate’s resonant requency, causing it to vibrate. If they made the entire plate a little thicker, it should help. This is also why it would only do it while the vehicle is warmed up... molecules move faster in a warmer temperature, making it easier for that resonant frequency to be hit.

    This is just my guess as to whats going on.
     
  3. _M_

    _M_ Well-Known Member

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    It may also explain why that plate is no longer available. Perhaps the new piece is thicker.
     
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  4. _M_

    _M_ Well-Known Member

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    How did they shim it?
     
  5. Zeromaz

    Zeromaz Member

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    Good point M. Mine is a 2017... anyone with a 2018 have this rattle? Or anyonw know when the newer plate replaced the older?
     
  6. Competition Orange

    Competition Orange Well-Known Member

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    Your guess is as good as mine. I asked the foreman but he talked around it and said the tech was confident it wouldn't return. We know how that went. Dealer ordered the part so hopefully that'll fix it. I'll update regularly.
     
  7. Competition Orange

    Competition Orange Well-Known Member

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    What do you mean the plate isn't available?

    You have the full new part number?
     
  8. _M_

    _M_ Well-Known Member

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    As far as I know it’s BR3Z-7007-A. Just replace the F with a B
     
  9. OP
    OP
    MustangNY

    MustangNY Member

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    Does anyone know since there now is a new part number if there will be a TSB? This happens to me after I've been driving around for about 45 minutes. I would like to take it into the dealership to get that piece replaced but explaining to them that the car needs to be very warm they would have to hear the problem for themselves and that would mean a technician taking a nice joy ride for 45 minutes which I dont approve of. Given that the whole transmission needs to be dropped for a $15 part they will definitely need to acknowledge the noise. Anyone have any suggestions?
     
  10. Action

    Action Well-Known Member

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    That’s a tough one. My rattle (which ended up being that plate), was easily reproduced after about 10 minutes of driving and it took me a total of about 9 weeks of the car being at the dealer for it to be replaced.

    Your best bet for a quick resolution would be to pay out of pocket. Otherwise prepare for a lon journey. Or maybe get lucky with a good dealer.
     
  11. Zeromaz

    Zeromaz Member

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    I drove mine around till it was warmed up and the sound was present. Drive it to Ford and asked the service guy to bring a tech out to listen to it right then and there
     
  12. _M_

    _M_ Well-Known Member

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    Did they replace your plate as well?

    Had a shop foreman ride with me this AM. He heard it quickly. Thought it was exhaust till he got down on the ground then determined it was coming from the front.

    I had already explained the issue we are all having but he was certain it wasn’t the plate. After a while he became less confident. We are going to look at it next week. They were too busy today.

    It certainly looks tight in there. When they are finding that it’s loose, are they finding it to be that way at the top of the plate which isn’t visible from underneath the car? Because the bottom of that plate looks nearly impossible to move
     
  13. Zeromaz

    Zeromaz Member

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    The new plate has still not arrived at the dealership yet. They are replacing it. If your guys would look into it they will see the plates our cars come with aren’t even made anymore. There is a different part number now. Obviously it happened enough for them to swap it out.
     
  14. _M_

    _M_ Well-Known Member

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    They already know about the part number.

    Since your guys have identified the plate do they know where the plate is lose, because the part of the plate that is visible from underneath is completely tight. No give at all. Wondering if it’s at the top or internal between the bell housing and engine.
     
  15. Zeromaz

    Zeromaz Member

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    They didn’t mention it. It shouldn’t be loose though. I believe its the resonant frequency that makes it rattle when warm
     
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  16. Competition Orange

    Competition Orange Well-Known Member

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    I'm still waiting on my plate to arrive at dealer. I was concerned about the dealer cold revving, dealer ended up dragging their feet for a couple hours letting the car cool down while I was waiting, and the foreman actually did a great job keeping the engine around 2k RPMs until the oil got nice and hot and sure enough it started going crazy. I'd say just schedule an appointment, no need for a 45 minute drive, just get it hot staying stationary around 2k rpms, and have them get it in a lift when it's hot. It'll be easy for them to figure out, it's the plate.
     
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  17. _M_

    _M_ Well-Known Member

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    So apparently today we figured out the difference between these two part numbers is the F is for the 5.2 and the B is for the 5.0. So don’t use this as the revised part number if there even is one.
     
  18. Action

    Action Well-Known Member

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    Just an update. My 350R is being bought back by Ford.
     
  19. Zeromaz

    Zeromaz Member

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    For a rattle from that plate?
     
  20. Action

    Action Well-Known Member

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    Ultimately yes, although the real issue was the multiple dealers and ford customer support that were pretty bad. My car was in and out of the shop since January for a total of close to 10 weeks.
     
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