Differential Unit problems of the 2008 Kia Motor Sorento

Vehicle made a progressive noise coming from the rear of the van. If sounded like oversized mud tires were on the vehicle. Brought it into the dealership and they said it was the rear differential assembly. The dealership said there were a lot of complaints about the rear differential assembly. This vehicle was bought new by myself and only has 22,508 miles on it. . At the same time the air compressor went out. This was also replaced. These parts should not have failed this early on a new vehicle.

I purchased this kia brand new in 2008. Had to take it to the dealership 3 times within the first 6 months because when I reached between 40 and 50mph the vehicle jerked. Was told each time there is nothing wrong. On the final time the service manager rode with me and told me it was the way I drove. I have now had this vehicle for 3 and half years. It has 67,000 miles. I am still having the jerking issue and now the entire rear differential needs to be replaced. I have researched different forums on different websites and have found that this seems to be an issue for a lot of kia Sorento owners. The dealership will not honor my warranty because I did not have the service done at authorized kia service establishment so I had to out of pocket pay $1100 to have my 3 and half year old vehicle fixed. I have owned many new cars and have never had this much of an issue as I have had with a kia with under 100,000 miles on it.