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Vibration @ 80mph+

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Old Aug 27, 2013 | 06:35 AM
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Default Vibration @ 80mph+

from idle to ~70mph car seems fine. 75mph~80mph+ the whole car vibrates. The rear view mirror vibrates so bad you cannot make out cars. The e-brake spring in the center console resonates also. When accelerating it is not as bad, but when holding a steady speed it seems worse and gets really bad when clutch in and slowing down.

I would think something rotational.
I've replaced:
*Both front wheel bearings
*axle bearings
Tires are brand new & balanced, even had them re-checked after they said they were balanced and I watched them.

Only thoughts are something relating to the transmission. I do have a cross-member mounted torque arm, so I know some more noise/vibration will come from this, but I know what I'm feeling is not normal.

Thoughts, ideas?
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Old Aug 27, 2013 | 08:34 AM
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ID suggest getting the tires road force balanced. I went through this awhile back with new tires. Some suggested road force and it cured the problem. Most Cadillac dealers have them.
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Old Aug 27, 2013 | 09:26 AM
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rode with a friend in the car and the vibration wasn't as bad. thinking driveline angle and/or u-joints.

Ben Mynatt by my house offers it..will check out.
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Old Aug 27, 2013 | 07:36 PM
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Another poss root cause to your vibration - the driveshaft.
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Old Aug 28, 2013 | 11:08 AM
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yep. It was checked when I bought it...but there is no telling.
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Old Aug 30, 2013 | 11:26 PM
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driveshaft,motor mounts maybe, wheels not torqued correctly
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Old Sep 1, 2013 | 10:42 AM
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Originally Posted by Brennen's01SS
ID suggest getting the tires road force balanced. I went through this awhile back with new tires. Some suggested road force and it cured the problem. Most Cadillac dealers have them.
im a tire noob, what is road force balance? sound like balance where its on a roller?
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Old Sep 11, 2013 | 11:17 PM
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Honestly I would start with basics.. alignment. Otherwise it may be mounts or some bad bushings.
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