If anyone has this same problem please let me know. I bought my jeep in august and immediately noticed a vibration problem. I brought it to NTB and had them check the balance of the tires. They claimed they were out of balance but when i driove off i had the same vibration. When i brought it to the dealership they said the drive shaft was to blame and they replaced the drive shaft. drove home and noticed the same problem once again. Brought it back to the dealer....to make a long story short i have had my jeep in and out of the shop for months and still no solution. This only happens on the highway traveling 70-80mph. at 60 it fine at 100 it fine. What should i do and who should i speak to? Presently i am waiting for a "special tool" to come in to measure vibration within the vehicle and see if it is within reason. my passenger seat will move at least 1" from the vibration. I am very tired of this problem. please help.