Thought this might help?
TEST B: VIBRATION AT HIGHWAY SPEEDS
Out of balance front wheels or tires.
Out of round front tires.
Improperly seated outboard front wheel axle shaft joint (fixed type) in front wheel hub.
Actions To Take
Inspect and replace tires if necessary.
Replace axle shaft and joint assembly.
Friday, November 7th, 2008 AT 8:35 PM