Just picked up my used Nitro with 52,000 kms(32,000 miles), and have searched thru the forums here=good info. Anyhow, I've had the torque convertor replaced in my Liberty, so I know the symptoms; but I have a different vibration in the Nitro. Starting around 35 mph until 80, there is a very slight vibe coming thru the seats and steering wheel. Some people may not notice it, but it is there. It doesn't feel like a wheel balance issue, but more of a driveline imbalance. Anybody else have something similar?