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

    53.8%
  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

    6.4%
  1. ABS550

    ABS550 Well-Known Member

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    I noticed mine on the drive home from the dealership. Day 1. However, there are many who have it crop up sometime later.

    Blake
     
  2. Blaster

    Blaster Well-Known Member

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    I think they got the boot over declining fortunes at Ford. Tuff to see them lose their jobs. They were very pleasant to me when I was buying.

    http://www.foxbusiness.com/markets/2017/05/16/ford-expects-to-cut-1400-office-jobs.html
     
  3. cbrookre

    cbrookre Well-Known Member

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    Yeah strange that mine took over 4k miles. Spoke to them today and they are going to try to balance the driveline. Has that been mentioned in this mondo thread before?
     
  4. shelbywannabe

    shelbywannabe Well-Known Member

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    I've had mine in a couple of times and they finally did notice the vibration after I took one of the techs out onto the turnpike and got it up to 62 miles an hour and he could really feel it, he submitted his findings two Ford late this afternoon and is waiting for them to advise him on how to proceed
     
  5. GT Pony

    GT Pony Well-Known Member

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    Many times over ... along with a half dozen other possible fixes. Hope they find the cause, keep us posted.
     
  6. 15Pony

    15Pony Well-Known Member

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    That's completely normal. The vibration when you get it up to 62mph is the Flux Capacitor kicking in, preparing to send you back to 1965. :lol::lol:
     
  7. cbrookre

    cbrookre Well-Known Member

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    Figured so, but I was on my phone which completely fails to let me do any searches...thanks! Seems like a way to hide the symptoms as opposed to understanding the root cause. What caused it (after 27k miles) to suddenly get out of balance? That is what I would want to know.
     
  8. cbrookre

    cbrookre Well-Known Member

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    It is building up the 1.21 Gigawatts needed to make the transition! 1.21 GIGAWATTS!
     
  9. GT Pony

    GT Pony Well-Known Member

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    That's an even bigger mystery than the root cause is. I've always suspected the rubber mounted center bearing carrier, which could degrade with time.

    I wonder if any aftermarket company makes a beefier center bearing carrier?
     
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  10. ScottsGT

    ScottsGT Well-Known Member

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    Somewhere in this thread I posted I was experiencing the vibration but thought it was tires. New tires and still on occasion get the cyclic vibration around 70. Weird thing is, it's not always there. Some days I notice it, other days nothing. When it is there it is ever so slight. My luck it won't be acting up when I take it in.
    It's not constant, kind of like a bad pinion angle. A womp......womp.....womp.....womp.....
     
  11. lugz

    lugz Well-Known Member

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    I'd guess the center bearing and massive guibo are the engineering band-aids to work around the vibration, not the cause.
     
  12. ScottsGT

    ScottsGT Well-Known Member

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    I just can't figure out why Ford went with this two piece DS to begin with? I'd like to know if anyone that has these issues replace the DS and had the problem go away.
     
  13. offroadkarter

    offroadkarter Well-Known Member

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    Because a 2 piece driveshaft has a higher critical rotating speed than a 1 piece made of the same material and length. You can watch tons of S197 II V6 mustangs (which had a 1 piece driveshaft unlike the GT's) with the speed limiter removed blowing the driveshafts apart on the dyno or on the road.

    I know I cite the panther platform a lot when talking about Ford's flaws but history tends to repeat itself. The panther platform has a long 1 piece driveshaft and back in 1999, a lot of police departments were complaining about driveline vibrations during high speed pursuits while driving 3.55 geared P71's. Ford contacted Alcoa and made what is called the "Alcoa Metal Matrix Composite" or AMMX/AMMC driveshaft to cure these woes. It's a popular upgrade for panther owners with gears to grab a 99-00 AMMX driveshaft as it has a higher critical speed than factory aluminum or steel shafts. (03-04 Marauders, like V6 S197II's, were limited to 117mph due to driveline vibes).

    I've read plenty of posts on here saying a 1 piece driveshaft didn't fix or even amplified the driveline vibrations. The solution to a vibration isn't to replace it with a less NVH complaint part.

    If this was a driveline vibration at 130mph+ coming from the bowing of the driveshaft, than upgrading to something like a carbon fiber one piece would work. Less rotating mass = higher critical driveline speed. But for a 55-70mph vibe, this isn't the problem. After seeing some videos of how much the S550 pinion moves up and down I wouldn't at all be surprised if bad driveline angles from the factory are the root cause. Haven't had time to look at my car though.
     
  14. smokinzx14r

    smokinzx14r Well-Known Member

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    I agree with the bad driveline angles , but why did mine work fine for 5k and then out of the blue it has a problem ..? Seems strange that some guys replaced the stock shaft with a new stock shaft just to have the problem come after a few 100+ miles .. In all the cases I have read in this thread no one replaced the carrier bearing and support rubber bushing . I'm thinking that because of so much movement in the rear pinion angles it's taking its toll on the carrier bearing and the rubber support in the carrier .. I'm not sure but I think when the dealer replaces the drive shaft it's a complete unit ( carrier bearing included ) .. some have had it fix the problem for a short time just to have it come back with more miles .. So maybe we have two problems ( carrier rubber support breaking down because of the bad pinion angles )...
     
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  15. Dominant1

    Dominant1 Well-Known Member

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    The Chevy Camaro has a carrier bearing ds on their cars 0 vibrations, Dodge Challenger has the same set up no vibes. I changed my pinion angles by shimming my trans down with 1/4 inch shims between the body and the x member and the vibes went a away i have a 1 piece dynotech ds as well! Also there are zero vibrations reported from gt-350 owners but then again ford made sure the car was balanced correctly because of tendencies of plane engines being prone to vibrations. The driveline angles in these are fubar from the factory, this is the root cause of the issue!
     
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