Vibration between 50 & 70 mph

Discussion in 'Issues, Repairs, Warranty, TSB, Recalls' started by icarumba, Jan 21, 2015.

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Do you experience vibration and rumbling between 50 and 70 mph?

  1. No

    53.9%
  2. Yes - V8/MT

    20.2%
  3. Yes - V8/AT

    12.5%
  4. Yes - V6/MT

    1.1%
  5. Yes - V6/AT

    3.6%
  6. Yes - EB/MT

    2.4%
  7. Yes - EB/AT

    6.3%
  1. Dominant1

    Dominant1 Well-Known Member

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  2. Cobra Jet

    Cobra Jet Well-Known Member

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    #2642 Cobra Jet, May 12, 2017
    Last edited: May 12, 2017
    Used to be able to "drive through it" after 70mph, but can't do it anymore. The vibration is really bad this time around. It's like I'm driving with square tires, like literally square tires - no joke.

    I wish the vibe was harmonious - LMFAO (kidding of course, as I do know the term harmonic). Maybe Ford should supply Professional Harmonica Players with every new Mustang - it would shift the driver into a better mindset instead of being plagued with the driveline harmonics.... :D:lol:


    Honestly folks - I have more repair paperwork for this G'D POS S550 Mustang than I do for my 23yr old Mustang Cobra, which has NEVER had any drivetrain issues in 143k miles, let alone the other S550 Quality Control issues I've had to deal with in only 23k miles of "new car" S550 ownership!! I mean really, WTF Ford?!?

    And what really pisses me off as well as other S550 owners having to deal with this on brand new S550's is the fact that Ford and the Ford S550 Engineering Team fully knew of the driveline issue prior to releasing the S550, as it was well documented in the documentary "A Faster Horse". But hell, here we are almost ready for the release of the 2018's and Ford can only come up with wrapping hose clamps around the driveshaft OR telling owners "ah, it's normal - thanks for your $30k, $40k, and $50k+, carry on and leave us alone now".

    I don't know if any of you go on any other sites - but this issue is now being documented by S550 owners over on the NHTSA website.


    BTW:
    1) The trans mount shimming will NOT make any difference if the differential internals are bad..
    2) The Ford SSM on hose clamping the driveshaft will not make any difference if the rear diff is bad...
    3) Clocking the DS, replacing flanges or replacing DS with new factory or aftermarket DS will not make any difference if rear diff is bad...
    4) Trying to get Ford to own up to the inherent issue that whomever assembles their rear diffs does not know proper assembly tolerances OR that possibly their Vendor is supplying inferior POS parts is like trying to raise the Titanic and sailing it again....
     
  3. Cobra Jet

    Cobra Jet Well-Known Member

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    #2643 Cobra Jet, May 12, 2017
    Last edited: May 12, 2017
    Here's the scans I promised to include from my Dealer Service Center work orders from my last visit on 04/24 and the diagnosis. Take note of the harmonics Hz measurement... and my vehicle has already had the prior work done (and extensively documented previously in this thread) due to the ongoing driveline vibe:

    1) front trans flange and rear diff flange replaced
    2) driveshaft replaced
    3) multiple prior tire rotations and "road force balances" on the original P-Zeros
    4) driveshaft clocked numerous times
    5) Ford SSM hose clamps attached
    6) use of the vibe analyzer multiple times on past visits
    7) Servicing Dealer brought another brand new EB PP to their lot to compare and confirm that my EB PP had definitive driveline issues

    Also, I replaced the Pirelli P-Zeros at only 18k miles in Jan. 2017 with a brand new set of BFG G-FORCE™ COMP-2™ A/S tires (nearly $1k out of my own pocket)....the issue is NOT tire related and I also had the car aligned too... IMG_5302.jpg IMG_5303.jpg
     
  4. 68fbjjz109

    68fbjjz109 Well-Known Member

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    I have been told from someone at Ford at a local track event, that the vibration issues may steam more from center support bearings than anything else.

    Take that for what it is worth, but I see alot of other parts being thrown at this with little change.

    I would caution the continual referencing of A Faster Horse as "well documented" evidence of this issue. The fact is we truly have no idea of the complete context of what that discussion was.

    Posting dealer service notes however is great for the community. Your dealer has been very thorough and that will help any here trying to stick it out.

    Bringing up a 20 year Cobra is also disingenuous, by that time the fox body had more than 5x the amount of market time that the S550 has enjoyed. That a whole lotta time to fix shit like this.
     
  5. smokinzx14r

    smokinzx14r Well-Known Member

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    #2645 smokinzx14r, May 12, 2017
    Last edited: May 12, 2017
    I'm seeing two problems here , ( A ) Factory drive shaft vibration .. ( B ) aftermarket drive shaft vibration .. Kelly seems to have a fix for the one piece drive shaft but I'm pretty sure that will not work for the factory two piece drive shaft ..

    Mine had zero vibration until I added the bushing locks outs and cradle lock out .. I needed them because I drag race the car and these parts really work for that ( 1.41 60 foot times )

    I can't see where shimming the rear trans mount would do anything at all with the stock two piece drive shaft since it's a only going to change the angle from the rear of the trans to the carrier bearing , and will not have affect on the rear half of the drive shaft or pinion angle..

    So has anybody really fixed the vibration on a two piece drive shaft ? From reading all these pages I have not seen a fix or a true cause of the problem... Like stated above my car had zero vibration and after the lock out kit the car vibrates from 45 to 70+ , so in my case these mods caused a vibration..

    So when we talk about this problem please make sure to tell us if you have a one or two piece drive shaft to just keep things clear.. Like I said Kelly seems to have the fix for the one piece drive shaft vibration but we have no fix for the two piece drive shaft vibration ..

    As for axles I have both stock and 800 hp DSS axles and still have the vibration , so I don't feel axles are the problem .. As for the rear end I burned up my track lock unit and replaced it with a low mile third member and still have the vibration .. So I'm ruling out the carrier as the problem .. I also checked the TQ on the axle nut as outlined by Kelly in another thread .. That was not the problem either ..

    So if you have a fix please post it up , if it's just guess work don't ..
     
  6. ABS550

    ABS550 Well-Known Member

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    Read post #1773. Mine is still silky smooth.
     
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  7. BMR Tech

    BMR Tech Well-Known Member
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    [MENTION=14278]smokinzx14r[/MENTION]

    Yes, I have improved my vibrations on a car with a 100% stock Driveshaft by doing the following:

    1: I have seen improvements with high speed vibrations by shimming the front of the IRS cradle down .500"~

    2: I have seen improvements with high speed vibrations by replacing the front DS to Trans mating bolts....due to bending them. Once these bent, the vibrations were very noticeable and they drove me nuts. I jacked the car up and ran the car in first gear and noticed the driveshaft was wobbling (crazy run out). Not sure if this could be some of the issues out there, but I now have the same type of vibration again and I honestly think they bent, again.

    3: I have seen improvements with WOT / heavy load vibrations (almost feels like bind / grind) by solidifying the differential mounts. I suspect this is simply because of the extreme pinion rise these cars have. To note, I also had this improvement on my blue car with a 1 pc DS over 2 years ago when building my 2015. My car went from trying to throw me out of the seat when I made a quarter mile pass, to being much smoother and tolerable (from installing diff bushings)

    I deal with more S550 customers than most people in this industry. I try to share as much as possible.

    I have 100% had customers have NVH issues with the axle nuts being loose.

    I have 100% had customers who were able to resolve vibrations with 1 pc AND stock Driveshafts by shimming either the trans, the IRS Cradle, or both.

    I have 100% had customers who have resolved vibration issues with differential modifications from BMR and other companies.

    I have SEEN, but not experienced or been given feedback - people claim to have minimized vibrations by using BMR cradle lockouts/bushings or Steeda IRS solutions. But I would like to point out, I have NOT seen this personally with my cars, BMR cars, or cars I work on - So I would never recommend that to anyone at the present time.

    The unfortunate part of this issue is, there are just so many damn parts involved. Right here in this thread you will see so many parts mentioned and methods to possible resolve it. It IS likely that most of them ARE and CAN BE issues that help people - but not every car nor is every persons tolerance for NVH the same. Most importantly the "V". Food for thought, a friend of mine complained about vibrations in his car for months. Myself and another friend both drove and rode in the car at all speeds - and it was the smoothest S550 I have driven. :O
     
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  8. Dominant1

    Dominant1 Well-Known Member

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    Smokinzx:

    Have you ever measured your pinion angles with your stock ds? The shimming of my x-member fixed the minor vibes. I have a dynotech Aluminum ds. If you find your pinion angles are off, what about shiming the carrier bearing on the stock ds to improve your angles! Its just a suggestion, I dont know if it will work. It all comes down to the measurements you come up with!
     
  9. smokinzx14r

    smokinzx14r Well-Known Member

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    Thanks Kelly , I just got out of the hospital and need some more time to heal , but I would like to get with you one day and have you take my car for a ride and tell me what you think .. No way can I take it to the dealer with the mods I have , they would kick me to the curb real quick !! lol ... I would say my vibration is on the bad side seeing I can't see out of the rear view at all at 65 MPH ..:eyebulge:
     
  10. smokinzx14r

    smokinzx14r Well-Known Member

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    No I have not check them yet , I just spent the last 4 weeks in and out of the hospital .. Once I feel better I will ... :thumbsup:
     
  11. GT Pony

    GT Pony Well-Known Member

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    Will be interesting if the new differential fixes the vibration ... keep us posted!
     
  12. Mustg3

    Mustg3 Well-Known Member

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    My vibrations were reduced when they replaced the diff, but now its starting to increase some 8,000 miles later.
     
  13. ANGST

    ANGST Well-Known Member

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    I think you have the answer right here. There are so many parts that can contribute to the issue . I think what we have here is "tolerance stacking" even if, all parts are "in spec", As more parts are added with slight deviation eventually you get a driveline that is "out" of spec (vibrates) . So there is no one issue , but a combination of factors , and depending on the variance of parts, the solution will be different .

    Also true are people's NHV tolerance . When I test drove my car I very much looked for vibration , and never noticed it . After having the car for 1-2K miles I could tell . Its only at ~49-53 MPH and 65-68MPH , and its 95% just noise . Nobody else seems to be able to tell . I had the driveshaft replaced , and still have the issue . I had the MTS4000 hooked up , and "in spec" . Really if it wasn't for this thread, I would of never noticed .

    Sometimes these forums are a blessing AND a curse :shrug:


    Kelly , thanks for your insights .
     
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  14. ANGST

    ANGST Well-Known Member

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    And there are a wide range of differentials for the Mustang.
     
  15. Cobra Jet

    Cobra Jet Well-Known Member

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    Yep. Car dropped off today 05/15 for the rear diff R&R.
     
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