My 14 3500 4x4. Dually has a vibration at 70 mph. After reading all solutions driveshaft tires out of balance etc that has not cured the problem i got out my tape measure due to my inside right side tire is wearing on inside corner. I measured from center of inside tire to center of front tire and it measures 12 ft 6.5 inches. O then measured left side and it measures 12 ft 7.25 inches. A difference of .75 inches. I am going to jack truck up and loosen ubolts on one side and see if i can pull axle in line and retighten ubolts and them measure distance again. They should be same distance on both sides front to back.
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