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    #1

    Vibration at certain MPH

    So it's been doing this for a little while and I can't figure out what it is. When going between 50 and 60mph the car will have a vibration that feels like it's coming from the front end but the front end is all new.. Steering wheel has little to no vibration.. I'm thinking unbalanced tire or maybe driveshaft? The wheel bearings are new too and I have checked them and they're fine. Any ideas?


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    #2
    so the steering wheel is not vibrating. Is the seat vibrating? the rear end?
    "To Find yourself, you must first lose yourself"

    -1973 Volkswagen Bus Westy
    -1986 Honda Magna 700cc
    -1989 Lincoln Town car Signature Series
    -2011 Subaru Outback

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      #3
      Yea the whole car vibrates but not the steering wheel


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        #4
        then it's probably the rear:
        Check:

        Driveshaft? Is it balanced? Is it seized?

        Tranny motor mount ?

        Wheels balanced?

        Doe sit happen all the time, ior is the vibration intermittent?
        "To Find yourself, you must first lose yourself"

        -1973 Volkswagen Bus Westy
        -1986 Honda Magna 700cc
        -1989 Lincoln Town car Signature Series
        -2011 Subaru Outback

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          #5
          +1 trans mount. if it's cratered, it'll press on the cross member at some point.

          Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
          rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

          Originally posted by gadget73
          ... and it should all work like magic and unicorns and stuff.

          Originally posted by dmccaig
          Overhead, some poor bastards are flying in airplanes.

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            #6
            on a side note, is it easy to replace (tranny mount) and how many are there?
            "To Find yourself, you must first lose yourself"

            -1973 Volkswagen Bus Westy
            -1986 Honda Magna 700cc
            -1989 Lincoln Town car Signature Series
            -2011 Subaru Outback

            Comment

              #7
              I believe there's only one on the cross member. Should be as simple as jacking the trans to support it and then unbolting the old mount and bolting the new mount in. (Granted it's not become one with the cross member lol)

              I think Energy Suspension makes a poly mount that works for our cars but I don't remember the part number...

              '78 LTD | '87 Grand Marquis | '89 Crown Vic (RIP) | '91 Grand Marquis (RIP) | '94 Town Car (RIP) | '97 Town Car (RIP)

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                #8
                i guess you can check to see if the mount is bad by stick a pry bar in there and try to move the tranny.

                I am just wondering about how it would cause the vibrating

                I am in the same boat as the OP
                "To Find yourself, you must first lose yourself"

                -1973 Volkswagen Bus Westy
                -1986 Honda Magna 700cc
                -1989 Lincoln Town car Signature Series
                -2011 Subaru Outback

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                  #9
                  I once bought a used Taurus that had a wheel balance issue. It only showed up as a vibration at highway speed. I would think a balance issue would have a distinguishable kind of vibration, but I have no way of describing what that would be. I guess you'd just have to imagine what kind of effect you'd get from unbalanced wheels and compare that to what you're experiencing. If the tranny mount doesn't show anything obvious, and if your wheels haven't been balanced in awhile, the balancing is probably cheap enough to try just to see what happens.

                  2000 Grand Marquis LS HPP, a hand-me-down in 2008 with 128,000 km; 175,000 km as of July 2014
                  mods: air filter box 'tuba', headlight relay harness, J-mod (around 186,350 km), 70mm throttle body, KYB Gas-A-Just shocks, aluminum driveshaft, ARA3 PCM

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                    #10
                    true, wheel blancing isn't a big deal.

                    chitownvic, does it happen (the vibration) when you give it little throttle, or is it independent of that
                    "To Find yourself, you must first lose yourself"

                    -1973 Volkswagen Bus Westy
                    -1986 Honda Magna 700cc
                    -1989 Lincoln Town car Signature Series
                    -2011 Subaru Outback

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                      #11
                      Vibration at certain MPH

                      The drive shaft is original to the car and I'm pretty sure balanced but in need of U Joints.. I put the trans in the car and know the trans mount is fine.. The vibration only happens at highway speeds around the high 40's to 60.. Anything slower or faster is smooth sailing and acceleration dosent matter. My money is on the wheels because they are old rubber and off the black town car and I truly have no idea how old they are I'm going to replace then soon and hope that fixes the problem


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                      Last edited by chitownvic; 10-28-2014, 01:20 AM.

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                        #12
                        Try swapping the wheels to the back 1 at a time, see if it feels different..



                        87 Ford LTD Crown Victoria Country Squire Station Wagon. 4.10's, Repacked Trac Loc, Boxed LCA's, Explorer Intake, 65mm T-body, 'Stang Cam, 'Stang Air tube, K&N, GT-40X Heads, 1" Spacer, 1 5/8 BBK's, 2.5" Pypes X-pipe w/high flow cats, Single Chamber Thunderbolts, B&M 'vertor, Po-lice Swaybars.

                        91 Mercury Grand Marquis Colony Park Station Wagon. K-Code, 4.10's, Repacked Trac Loc, MK VII LSC Engine, 'Stang Upper Intake, Stang Air Tube, K&N, 65 mm T-Body, 'Stang Headers, 'Stang Cat Pipe,'Stang Torque Convertor, 2 Chamber Thunderbolts.

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                          #13
                          I have had 2 things in the past that made the same vibration. First was a driveshaft U joint but you should hear a clunk when shifting from reverse to drive. The second was water in the tires from crappy air pumps on a slow leak but that got worse over time.
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                          89 LTC 429>557 Cobrajet stroker
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                          "If I could separate what's real from what I've been dreaming I could live to fight another day"

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                            #14
                            No clunk but I know they're probably original to the car.. That's crazy about the tires I can totally see that happening because people rarely drain their compressors or have a dryer on them


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                              #15
                              Is it fine when the car s cold, but started happening once it warms up?
                              "To Find yourself, you must first lose yourself"

                              -1973 Volkswagen Bus Westy
                              -1986 Honda Magna 700cc
                              -1989 Lincoln Town car Signature Series
                              -2011 Subaru Outback

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