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I have a 2010 CTS, AWD, 3.6. When accelerating I have a

Customer Question
I have a 2010...

I have a 2010 CTS, AWD, 3.6. When accelerating I have a vibration that gets progressively worse as speed increases, especially up to 65. If I let off the gas, the vibration goes away completely. comes back when I push on the gas pedel. The vibration maintains even when on cruise, when the car is just maintaining speed on level ground. I replaced the driver side front axle a while back, but not the passenger side. The drivers side still feels thight, but the passenger side clicks when i move it or rotate the tire. Feels dry inside. I have crawlled under the car and looked at the drive shaft, prued on everything, and I can't find anything lose front to back. What do you think it might be?

Mechanic's Assistant: Where exactly do you think the noise is coming from? And how long has this been going on?

Started about a month ago, and has progressively gotten worse. It sounds like under the drivers seat. Not only a vibration, but a clunk from time to time. I am not sure the clunk is related, but that is definetly under the drivers seat or just behind it.

Mechanic's Assistant: Are you fixing your CTS yourself? What have you tried so far?

I have done some of the work myself. Brakes, Oil changes, and the broken CV joint. Replaced that, and installed a broken enhine mount bracket, and moter mount on the drivers side. Broken engine mount bracket is what took out the CV and axle.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

That should be it.

Submitted: 1 month ago.Category: Cadillac
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Answered in 2 minutes by:
3/16/2018
Cadillac Mechanic: Gm Tech (Cam), Cadillac Mechanic replied 1 month ago
Gm Tech (Cam)
Gm Tech (Cam), Cadillac Mechanic
Category: Cadillac
Satisfied Customers: 30,109
Experience: GM Grand Master Technician 2007. 14 years experience.
Verified

Hello there, I am Cam.

I am Licensed technician at a GM dealership with more than 16 years experience. 
Like you, I am a user of this website and as such, any billing questions should be sent to customer service.

I ask that you please provide details and communicate with me so we can make your experience here worth 5 stars! I am around most days but not every minute of every day. If you reply while I am offline, I will respond when I am next online. 

I am reviewing your request and will post in a moment.

Does turning see to change the feel of the vibration?

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Cadillac Mechanic: Gm Tech (Cam), Cadillac Mechanic replied 1 month ago

Also lets talk a moment about your tires, are they all the same with the same amount of wear?

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Customer reply replied 1 month ago
They are all the same and no wear. I figured if the tires were the problem the vibration would not go away when the car was coasting
Cadillac Mechanic: Gm Tech (Cam), Cadillac Mechanic replied 1 month ago

YEs and no, the vibration may be related to torque in the system. Under acceleration there is torque is being transferred.
The item I feel is the issue is a drive shaft issue. That would be more consistent with your issue and location. I would not rule out the front axle shaft, but there rear drive shaft does have u-joints on it and they would cause the type of issue you have.

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Customer reply replied 1 month ago
definately in the drive shaft system, torque related. My hope was this is a common problem at around 100,000 miles, and you would be able to say , from your description, I know just what this is. Ha Ha, no such luck. This thing is on jack stands, with very little room underneath. it is a lot of stuff to pull off just to trace it down. If you are not sure, and I can't figure it out, it is off to the mechanic with more expertice than I have. Thank you for your help.
Customer reply replied 1 month ago
No response?? This isnt working out too good. I can't follow if you are supposed to call, or not. Good grief. Please dont call. I am shutting down my end of this conversation. John
Cadillac Mechanic: Gm Tech (Cam), Cadillac Mechanic replied 1 month ago
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Gm Tech (Cam), Cadillac Mechanic
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