On the highway only on right corners you can feel the vibration and dull thumping from the left front. Also, the front left tire has wear along the outside edge.

I was under the car today and noticed the guide rod rubber boot is cracked and so is the outer tie rod end. I know this warrants replacement of both but which one do you think is the problem? (or both)

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R