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vibration in rear end

  1. 99-03 7.3 Drivetrain Problems
    I have had a vibrations for the the past 30,000 miles. The vibration is coming from the rear end. The vibrations around 10 mph has a high frequency with a low amplitude. The vibrations between 40-45 mph and above 70 mph feels like wheel hop. I have changed tires, had the tires rebalanced twice...