A lot of Vibration above 95mph

[gschott]

I just returned from a 2000+ mile trip in my CTS. On a part of the trip I put it to the floor to pass a few trucks, above 95 mph, I had a severe vibration. The car just passed 40k miles, the tires are original Michelin's that I had balanced and rotated a few months ago. The ride is very smooth at regular highway speeds. Maybe a bad balance, or something else? Anyone experience this with their CTS?

[kissdaring]

Originally Posted by gschott

I just returned from a 2000+ mile trip in my CTS. On a part of the trip I put it to the floor to pass a few trucks, above 95 mph, I had a severe vibration. The car just passed 40k miles, the tires are original Michelin's that I had balanced and rotated a few months ago. The ride is very smooth at regular highway speeds. Maybe a bad balance, or something else? Anyone experience this with their CTS?

right here man, i have been having this problem since i went with aftermarket 20's i get a crazy vibration i have balanced them and got an alighnment done but that did not really help the cars steering wheel, seats and dashboard shake like crazy. i have been told numerous things but that all costs money but then again i think is worth a try given that the dealer would charge more just to tell you what the FFUUCCKKEENN problem is.....

do you have your stocks on or are you riddin' on aftermarker rims&tires?

here maybe this will help
http://www.cadillacforums.com/forums...d-shaking.html (dash board shaking......)

[87vertgt]

maybe a weight fell off? maybe you hit a pothole and bent the rim....check that...if not....alignment....

[silver bullet]

Do you have the right bolt pattern, if not are you using hub centric rings. Some cheap wheels usually made in China will never balance properly.

[eblend]

Sounds like you don't have the right bolt pattern on those rims. I remember my old grand am used to be 115 but I put 114.7 on there as they are more common and more choices. Using hubcentric rings I didn't have any problems, but you also got to be very careful when you tighen them....go in a star pattern and little bit at a time, as they will slowly adjust and sit correct. I am not sure if thats your problem or not but though I would drop a line, maybe might apply to your situation

[gschott]

Thanks for your responses. The car is 100% factory stock. The only thing I've added is a package of sunflower seeds in the console. (keeps me awake). It's a mystery, the balance is great until I hit 95. I'll take it to the dealer to check out the front end. I hadn't thought of an alignment, but at 40k miles it might need one.

[the cadillac kid]

Originally Posted by 87vertgt

maybe you hit a pothole and bent the rim....check that...if not....alignment....

^^ try these suggestions first before taking it to the dealership & having to ride around in a cobalt loaner for a week

[matthightower]

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dont go above 95

[CaddiLackin]

Well there you go! The sunflower seeds are throwing the balance of the car off....

I agree that no where in the US is 95 mph legal to drive, however, if something is not right about your car...somethings not right.
I had the same problem with mine when i hit 75+ on the freeway. Dealership didnt wanna even look at the car and thought it was funny to tell me I need to slow down and drive the limit, where there is no vibration.
I told them to get bent...went down the street to a Chevy dealer, gave me a balance and alignment...
car runs almost as smooth as her paint...
Good luck my friend

[LS6TT]

many things can be the cause.....95+ mph, what are your tire ratings? balanced? all lugs tight?, bad shocks? wind? bad road?