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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » vibration

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    6/30/2017 8:39 PM  #1

    Wag8142
    FYI FORD Member

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    From: Laurel Ms
    Registered: 9/01/2015
    Posts: 33

    vibration

    I have a 302 in a 66 with a AOD Tranny . I have a vibration That I can't find ,I had the drive shaft checked and still have the vibration at highway speed once I reach the speed limit ..............anyone have any suggestions ?

     

    6/30/2017 9:09 PM  #2

    70 Coupe
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    From: Nebraska
    Registered: 2/12/2017
    Posts: 295

    Re: vibration

    Correct flywheel for the application?

     

    6/30/2017 11:20 PM  #3

    Ron68
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    From: Mukilteo, Washington
    Registered: 4/01/2013
    Posts: 1,653

    Re: vibration

    Correct driveshaft pinion angle? Tailshaft housing bushing not worn? What yoke are you using on the driveshaft? Did you have any like vibration prior to the transmission swap?

    68 coupe - 351W, 4R70W, 9" 3.25 -- 65 convertible - 289 4v, C4, 8" 3.00
     

    7/01/2017 6:58 AM  #4

    BobE
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    From: White Plains, NY
    Registered: 4/04/2013
    Posts: 2,798

    Re: vibration

    It would be helpful to provide more details ... what speed does it start, does it get continue to get worse as speed increases, does it drop when the tranny goes into OD?  Try to isolate the vibration source from driveshaft RPM and engine RPM.  Maybe rear gears/bearings are worn, or axle bearings?  Tire/wheel balanced?  Check balance weights on the wheels, the stick-on type can fall off.

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

    7/01/2017 7:38 AM  #5

    MachTJ
    I FYI 24-7

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    From: Wisconsin
    Registered: 5/18/2014
    Posts: 348

    Re: vibration

    Start at one of the easiest things first. Do any of the tires have any abnormal wear or bulges? Does it look like there could be any wheel weights that have fallen off or moved?

     

    7/01/2017 9:34 AM  #6

    Hornman
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    From: Mansfield, Texas
    Registered: 4/01/2013
    Posts: 1,568

    Re: vibration

    Are you running the 8 pound transmission tailshaft counterweight? Lots of folks find that counterweight helpful in damping driveline vibration.

     

    7/01/2017 10:42 AM  #7

    whlnut
    I FYI 24-7

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    From: Brunswick, GA
    Registered: 4/02/2013
    Posts: 317

    Re: vibration

    Is the vibration present at the highway rpm while parked?

     

    7/01/2017 11:22 AM  #8

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,679

    Re: vibration

    MachTJ wrote:

    Start at one of the easiest things first. Do any of the tires have any abnormal wear or bulges? Does it look like there could be any wheel weights that have fallen off or moved?

    X2!  Whenever I've had vibrations at speed I've learned to check the tires first.  I spent a lot of money years ago on one of my cars trying to fix what turned out to just be bad tires.  Often you cannot see the damage that causes this, but once tires are 5 years old or more, regardless of wear or mileage, they are suspect.  There is a date code on them that can tell you how old they are if you don't know.  After 5 years they start to break down internally and you will get vibration at speed.

     

    7/04/2017 12:47 PM  #9

    Wag8142
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    From: Laurel Ms
    Registered: 9/01/2015
    Posts: 33

    Re: vibration

    it only vibrate once I get off the accelarator

       •Thread Starter
     

    7/04/2017 1:00 PM  #10

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,679

    Re: vibration

    At a specific speed or whenever you let off the accelerator?  Is it worse the faster you are going before you let off, or the same regardless?

     

    7/04/2017 8:03 PM  #11

    Wag8142
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    From: Laurel Ms
    Registered: 9/01/2015
    Posts: 33

    Re: vibration

    Once I get to cruising speed in over drive and ease off of it .She starts to vibrate ......

    ​ I would like to thank ever one  for their  help with this vibration.

       •Thread Starter
     

    7/04/2017 8:27 PM  #12

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,679

    Re: vibration

    Hornman wrote:

    Are you running the 8 pound transmission tailshaft counterweight? Lots of folks find that counterweight helpful in damping driveline vibration.

    I would probably give that a try.  Doesn't sound like tires from what you're describing.  Sounds like a harmonic set up due to driveline speed.

     

    7/04/2017 8:31 PM  #13

    Wag8142
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    From: Laurel Ms
    Registered: 9/01/2015
    Posts: 33

    Re: vibration

    where can I purchase it 

       •Thread Starter
     

    7/04/2017 8:47 PM  #14

    Hornman
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    From: Mansfield, Texas
    Registered: 4/01/2013
    Posts: 1,568

    Re: vibration

    Wag8142 wrote:

    where can I purchase it 

     
    Junkyard, maybe. Or bolt 8 pounds of steel to the tailshaft.

    Last edited by Hornman (7/04/2017 8:47 PM)

     

    7/05/2017 9:15 AM  #15

    Michael H.
    I FYI 24-7

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    From: Laurel, MS
    Registered: 4/01/2013
    Posts: 869

    Re: vibration

    I bought mine on ebay... solved my vibration problem with my T5

    Here's a link to my vibration thread.  It has a picture of the counterweight for the T5... not sure if it's the same for AOD or not.

    http://fyi.boardhost.com/viewtopic.php?id=7427

    Last edited by Michael H. (7/05/2017 9:36 AM)

     

    7/06/2017 9:01 AM  #16

    Rufus68
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    From: Knoxville, TN
    Registered: 4/26/2017
    Posts: 924

    Re: vibration

    What kind of engine and transmission mounts do you have?  Are your mounts polyurethane or rubber?  If they are not rubber, then consider that the reason for rubber mounts is to isolate vibrations.  If anyone needs to install the counterweight, then I'd definitely recommend against hard mounts.

    1968 T-code Coupe with a 302.  Nice car, no show stopper for sure, but I like it.
     

     

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