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Discussion Starter #1
hi all im having a problem with my cougar when im driving from takeoff till 50mph the car shakes pretty bad but after that its smooth as butter, also when i apply the brakes it feels like the front end is going to fall off. I figure that is cause it needs new brakes/ rotors but for the vibration problem could you guys help me out with what it could be. Im gonna jack her up tomorrow and take the wheels off to get a better look.
 

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in my experience vibrations that occur at a certain speed then disappear after a certain speed is always wheel balance. I forget the actual science behind this. I should google it something about natural vibration limits bla blah. All i know is its still vibrating even though you can't feel it. The vibration you feel when braking is most likely warped rotors/drums.

Also while you check your stuff out, with the wheels still on and tight (but lifted off the ground) grab the tire and try to jiggle it left and right if it moves thats a steering component issue. Jiggling up and down would be wheel bearings. Have a friend move it while you look to see whats loose.
 

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well i was checking everything out and replaced the two front tires cause one had i busted belt. I replaced both cause i didnt have one with the same hight ratio so i put 65's on the front. It a little better but the vibration is still there. Seems like when i first drive it its fine but if i hit a good bump and makes a noise on that side then i start getting the vibration. Also i think my brakes are contributing to it to when it hit the brakes it pulls to the right and vibrates bad.

Does anyone have a blown up diagram of the front suspension and rear also just in case
 

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if you brake and it pulls to the right u have a frozen caliper on the left side. Look at your pads for uneven wear and rips/tears in the piston or the dust boot. Also check to see if the pins are well lubricated. While you have it apart take the rotors to make sure they aren't to thin and to make sure they aren't warped.

Finally if most of the vibration while driving was taken away after replacing the front two tires have the rears balanced, chances are those rears are out of balance as well. When you replaced the front two those had to be rebalanced but most shops wont do it unless you ask. Usually they'll do it for free.
 

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Follow master's suggestion and start checking all your front end bushings. If you've got a fair sum of miles on your car, I'd start with checking the front strut rod bushings.
 
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