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If, after you have the drive shaft re-balanced, you still have the problem, contact a local truck shop that can high-speed balance your wheels AND cut the tires to round. I had a similar issue with my 23' Coachmen -- swapped tires, rebalanced wheels, rebalanced drive shaft and replaced u-joints -- but it turned out my tires were not round! They used a laser sight, cut down down the high spots, no vibration at any highway speed. But I don't have a brake on my drivetrain so you're problem may be there after all. |