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car shakes at 50-60 mph

Discussion in 'Suspension Modifications' started by sabredog, Jun 4, 2006.

  1. sabredog

    sabredog New Member Established Member

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    i have an 03 cobra convertible that starts to shake,body and steering wheel,at about 50 -60 mph and then gets better as you go faster.i have force balanced the tires and checked for susp. looseness.grabbing frt wheels and checking for any movement.would a wheel bearing possibly cause this.it is very strange.seems more severe at times and mild at others.i'm confused.the car had been hit in the left front by the previous owner.but all was repaired including a new wheel and l/frt wheel bearing.any ideas?thanks i'm a new guy.
     
  2. ShelbyGuy

    ShelbyGuy Steers With the Throttle Established Member

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    yup could be a wheel bearing

    mustangs eat front wheel bearings like candy

    irs mustangs eat all four wheel bearings like candy
     
  3. sabredog

    sabredog New Member Established Member

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    any idea how much frt wheel bearings are.what is the torque spec. for the frt hub bolt.thanks
     
  4. sabredog

    sabredog New Member Established Member

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    nobody else have a simular problem?
     
  5. vipergts281

    vipergts281 New Member Established Member

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    Like Shleby guy said, it could be the wheel bearings. Check to make sure the bolt is tight.

    Btw, what color is your Cobra? I am in Newark almost every week, I live close by. I may have seen you around. What color is/was your SRT 4?
     
  6. sabredog

    sabredog New Member Established Member

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    my srt4 was red,sold.my 03 cobra conv. is dsg,black top.i'll keep an eye out for you in newark.very nice car.saleen wheels?
     
  7. vipergts281

    vipergts281 New Member Established Member

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    You had to of seen me before in the area. I am usually with some Mach 1's, red, blue, and white.

    Saleen replica's, 18x9 all around.

    Let me know if you have any questions about these cars, I've been hanging around this site for awhile, so I should be able to help you out or atleast point you in the right direction.

    :beer:
     
  8. sabredog

    sabredog New Member Established Member

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    do you know the torque spec. for the frt wheel bearing hub bolt.i may replace them and i'd like to know if running them down with a 1/2" impact is ok.
     
  9. vipergts281

    vipergts281 New Member Established Member

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    ShelbyGuy probably knows. I do not.
     
  10. ShelbyGuy

    ShelbyGuy Steers With the Throttle Established Member

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    its never ok to impact a bearing on (unless you're working on commercial/industrial vehicles and they use some bigass torque wrenches too)

    240 lb/ft
     
  11. sabredog

    sabredog New Member Established Member

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    thanks shelby guy!
     
  12. toro1966

    toro1966 Toro 66 Established Member

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    I am having the same problem. My steering wheel shakes pretty bad at about 45-50 miles per hour. I gues I'll just take it back into the dealer and let them worry about it. I'll tell them to make sure they check the wheel bearings. Thanks
     
  13. sabredog

    sabredog New Member Established Member

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    well ,i replaced the wheel bearings and torqued to 240 ft.lbs.,the car still intermittently shakes .seems to do it from 50-60 mph.it's not the tires.they have been force balanced and rotated.possible p.s. rack?shelby guy, any other insight?car is very smooth at all other speeds.thanks
     
  14. ShelbyGuy

    ShelbyGuy Steers With the Throttle Established Member

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    well, if you dont have c/c plates, there's the big rubber knobber thingy that is the upper strut mount. mine were pretty worn out and made a groan/clunk on slow turns.

    rack bushings too, maybe

    honestly though the evidence points to tires. that you had them balanced doesnt mean all that much as a bent wheel will balance if you add enough weight to it. it'll still go thump thump thump down the road though.

    if these are goodyear eagle f1 tires, throw them away.
     
  15. vipergts281

    vipergts281 New Member Established Member

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    My car makes those noises. Do you know where can I find replacement upper strut mounts? Are they hard to install?

    Thanks.
     
  16. TroyV

    TroyV Brakes only slow you down Established Member

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    Amen. This is sage advice... F1's are the worst balancing-est, uneven wearing-est, no pressure holding-est tires EVER!
     
  17. toro1966

    toro1966 Toro 66 Established Member

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    Well mine is going into the dealer tomorrow to have it looked at. I am hoping they are of some help. I know it is not the tires being balanced. The tires have been changed and balanced (BFG COMPs). My suspension is not modified and I have 17000 miles on the car. It has been doing it since I first got it. I brought it into them shortly after I bought it - brand new - and they said it was tire balance and was not covered under warranty. They wanted to charge me 100 bucks to balance the tires. I told them no thanks and then had them balanced at goodyear. Didn't fix the problem. I just never got back around to bringing it back into them until now. If they try and give me the "it's a balancing problem" again crap I am gonna be pretty peeved.
     
  18. sabredog

    sabredog New Member Established Member

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    i replaced the 2 frt tires with bfg kdws in the stock size.i've done a rim runout test on all 4 wheels.they are ok.a driveshaft wouldn't act like that would it.if it started to viberate it would continueas speed increases,correct?
     
  19. sabredog

    sabredog New Member Established Member

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    toro1966,if the dealer fixes your vibe.please post the results for me.thanks
     
  20. vipergts281

    vipergts281 New Member Established Member

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    Do you plan to drive in the snow often?

    KDW's would have been a better choice imo. The "S" in KDWS stands for snow. KDW is for rain (wet), and KD is a dry tire.
     

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