I have an 88 Integra with 155k miles. The engine runs well. Automatic trans shifts firmly. It has developed a vibration under load at about 55mph and up. The vibration is slowly getting worse over time. It's not a tire problem. All the tires are relatively new and in good shape.
Under load, the car vibrates at about tire rotation speed. It seems to be noticeably worse when the car is warmed up. If I let off the gas briefly, the vibration disappears.
Any ideas? I'm hoping this might be const velocity joints.