I replaced my cv joint axles the other day, and then drove it 90 miles round trip to school. Drives like a dream until 75mph, then there's a new vibration, like a loud hum, almost like loud bass. It it's worst with acceleration, and it responds to it. Say, I'm just getting up to 75, it will start, set the cruise on eighty, and it's constant. Then I cut the cruise and let off the gas for a second and it cuts out until I accelerate/maintain75-80 mph. I thought it might be my old tires on the front(yes, I knew they needed replaced anyway) So I got those done today. Again, drives wunderbar until 75mph. Anyone have any ideas? Thanks in Advance!