I bought this Dodge Ram Big Horn with a hemi engine and almost immediately it started vibrating when approaching 50-65 miles per hour. Took it back to dealership where I bought it and at first they denied the problem until I went with mechanic to point out the problem with the vibration. They recommended a new torque converter which they installed........no fix. I've had 3 mechanic look at the problem. Three with the original dealer and a fourth with another Chrysler dealership. Said it was a problem with the hemi with the conversion of cylinder changing at different speed from firing at 8 cylinders down to 6 as a fuel saving procedure. Reading through the circular at the Ram dealership this engine is suppose operate SEEMLESSLY during the conversion..........but it DOESN'T ! This was an expensive truck and there is no reason or excuse for the vibration. I feel stuck with this d...mn truck. How it made truck of the year twice in a row is beyond me. I'm contemplating filing for the Georgia Lemon Law on this truck. HELP !!!! Jack