just bought a used 2500 short bed extended cab 4x4. The truck has about 52,000 on it.


It has a bad vibration, enought to make the rear window move when at idle. However, if I touch the gas it goes away.


Also, the vibration comes on strong at anything above 55 mph. Brand new tires were just put on less then a week ago so I do not think that is the problem.


This happens in 2wd drive.