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I have a 2000 durango that vibrates bad at about 55 mph and up put new tires on it to make sure it wasnt the tread any feedback would be appreciated its 4wd 4.7 engine.
Need further info. Does it happen when under power or coasting? Can you feel it in the steering wheel? Is the vibration coming from the front or rear? As you can see, having as much info is better for us to help in the diagnosis.
The vibration seems to be coming from the back but the whole truck vibrates its ok as long as u dont hit highway speed and seems to lighten up around 70
You just might have an out of balance or bad tire. I know they are brand new but a defective one I would not rule out. Maybe a slight bent rim but you should feel that at lower speeds too.