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I have a 2001 Ch613 when i hit 50mph it starts to vibrant but as soon as i get over 65mph it smooths out I have king pins done,both drive shafts balanced, new u joints and still same problem?

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2001 Mack Ch613 460HP

Im getting vibration as soon as i hit 50mph-65mph after 65mph it goes away I have done Kingpins had both Drive shafts balanced, New Ujoints and still the same problem



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