2017 Shelby GT350 - rear end/ driveline vibrations - suggestions?

Discussion in 'Shelby GT350 Mustang' started by Hiland, Apr 30, 2020.

  1. Hiland

    Hiland Member

    First Name:
    Erik
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    I am the original owner, car has 8,500mls, no tracking, no mods.
    From the moment the car was broken in I had some light rear end vibrations at 80+mls/hr, i think right rear. Unlike wheel imbalance issues these vibrations feel like a high speed drill and becoming a hum at 100mls/hr and up. Dealer checked this out, balanced wheels, nothing.
    Since I dont drive 80mls/hr and up a lot, its my weekend toy, i don't notice it a lot but of course when I rip it up briefly it gets anoying.
    Long story short I kept procrastinating until yesterday when I had to go in for an oil service.
    Dealer put the car on their lift today, checked out the driveline at max 120mls/hr and they did confirm the vibration I was talking about at an unusual level, more then tolerated. The problem is that after checking everything they couldn't find anything faulty.
    My options are leave it alone, not an option, or they will call a ford engineer to check it out which can take a while.
    I have owned several M3's, and AMG C63, several Audi's and a 911 and never experienced something like this, it is unacceptable for a car made for speed.
    It's less refined than the German's and that's fine, I can deal with the rattling shifter and noisy valves when the engine is cold, its the nature of the beast, but it should be free of vibrations at high speed cruising.
    Has anybody else experienced something similar?
    Any suggestions you may have would be greatly appreciated.
    I really love the car, it's the most fun car I have ever owned.

    Thank you.
    Erik
     
  2. Lilmags500

    Lilmags500 Active Member

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    Jody
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    There is a TSB for drive line vibration in the GT350's , Give me a minute looking now .....
     
  3. Lilmags500

    Lilmags500 Active Member

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    SSM 45938 - 2015-2017 Mustang Driveline Vibration At Highway Speeds
    Some 2015-2017 Mustang vehicles may experience a driveline vibration directly related to a vehicle speed of 70-100Kmh (50-70Mph) and is perceived as a tremor in the floor pan, seat track, or steering wheel and may be heard as a rumble, hum, or boom. Before replacement of any parts be sure to verify the concern with a road test and visually inspect the driveshaft for damage, undercoating, incorrectly seated universal joints, rotate the driveshaft by hand to feel for any binding or end play in the universal joints. If no concern is found check and correctany tire balance issues using Loaded Hunter Road Force® Method. If a concern isstill present balance the driveshaft using the Mastertech® Series MTS 4000 Driveline Balance and NVH Analyzer. Refer to Workshop Manual Sections 100-04,200-04Aand 205-01. Use labor operation 1007D and any appropriate combinations.

    Your dealer should have been aware of this , I found it in less then a minute ..... Its not a wheel issue .
     
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  4. DCShelby

    DCShelby Well-Known Member

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    Robert
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    I don’t think dealers read them very much.
     
  5. OP
    OP
    Hiland

    Hiland Member

    First Name:
    Erik
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    Thanks for the heads up on this TSB.
    I don't think it's the wheels. I am waiting for a return call from the dealer to verify with them what was done.
    Dealer said yesterday they went over everything under the car and they keep saying that they cannot copy my findings because they are not allowed to take the car over 60mls/hr. This last point I find particularly disturbing, they are not allowed to drive the car in excess of 60mls/hr so the ball stops there? WTH? Of course I am not keen to have just any technician get behind the wheel of my car and rip it up to 120+mls/hr but there has to be a way and I certainly don't make this up.
    I passed on your tsb to the dealer and they are going to call me back Monday.
     
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  6. DIB2016

    DIB2016 Well-Known Member

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    Tell them you want the lead tech to do a ride along with you. Take the car to the vibration point so they can feel it.
     
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  7. OP
    OP
    Hiland

    Hiland Member

    First Name:
    Erik
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    Good idea, will do.
     
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