Bought a 96 Dolphin 535 last fall. Drove it from Flint, Michigan home to Terre Haute, IN ( about 550 miles). Very sloppy steering and a vibration that started at 40, peaked at 48, and stopped compl...
The rig is on a chevy chassis, I balanced the front tires when they were all double coin. When I went to the Michelin I moved the front tires to the tag axle. Mechanic checked the u-joints & carrier bearings before any changes were made. If you accelerate out of the vibration, let off the gas, and put it in neutral you will coast back through the vibration as you slow down.