I test drove the car on 12.29.2014 and I mentioned to the dealer that there is a vibration between the speed of 30 - 65, 70. Also the car was a little jumpy and noticed the tire pressure was 39 psi. We thought it was the balance and I asked from the salesman to fix the tire pressure and the balance and he promised me that they will take care of it, so the next day I bought the car.

After I drove home about 50 miles away I noticed that it was still jumpy and the vibration was there. When I got home I checked the pressure and it was still 39 psi. Automatically I realize that they didn't do anything to the car. Just washed it.

I took the car to a GMC dealer in Long Island and they told me they didn't notice the vibration. Today I just went back to the dealer I bought the car from and started the process of resolving this problem. The mechanic who we test drove the car together seems to be very knowledgeable. He balanced the wheels again and the vibration is still there. He checked the car on the lift and suggested that we have to change the drive shaft because its got a little play. Lets see if this will solve the problem.

If any of you had this done successfully please contact me. Hkusp9mmsd@gmail.com

The ride is substandard to my old 2007 GMC Yukon XL Denali, which I bought new and had 197k miles.

You feel every pebble or road imperfection. We told the salesman and they promised that we would get a call once a new similar vehicle came on the lot to test drive You get the typical response as if this was a $5,000 used car and not an $78,000.00 premium SUV. On our second visit to the dealership, we rode in another customer's car, who happen to be there, and the ride was much better - smoother. We told the salesman and they promised once again that we would get a call once a new similar vehicle came on the lot to test drive. No call yet and we just brought the car back in for a second time as the transfer case switches the car to 4WD for no reason. First it was a loose wire in the transfer case and then it was a computer program.

My car at 1900 miles had a loud sound underneath it, sounded like transmission made the noise, called Onstar and they ran a check on the whole car and said everything was OK, so I continued to drive it. Noticed a vibration that cycled at speeds from 30 to 70, took it to the dealer they told me the left CV boot was cracked and they decided to put a new axle in the front.

I picked the car up and drove it about 5 miles and the vibration was still there so I took it back and the Service Manager rode with me and told me he thought it was in the tires. He told me to come back and he would put new wheels and tires on my car. While I was there I drove 2 or 3 new Yukons and 2 of them had a rough ride and a similar vibration. They changed my wheels and tires and the vibration was still there.

I told them I love the car and wanted to keep the car if the vibration was repaired. I was told they had no fix at this time. I have had my car at the dealership for 12 days now, paying a $876 payment with no car. I am not happy and to add insult to injury, they called me back and told me they put my car on a vibration calibration machine and it was in acceptable operating range. I told them maybe acceptable to them but not me.

My 07 Avalanche rides better than the new Yukon with no vibration. Next step is for a field manager to look at my car. Been to dealership over 4 times now and looks like more visits. Worst experience with GM I ever had. I will say the dealership has really tried to help me/ Let's see what GM does. I have 2 other GMs, maybe time to go to look at Ford products, never thought I would say that. .

IF YOUR HAVING THIS PROBLEM PLEASE POST IT SO I CAN SEE IF I AM ALONE