Folks-

I have a shaky steering wheel at highway speeds, its not a constant issue and doesn't seem to have anything specifically to do with the road condition. Sometimes I notice its shaky and the roads seem totally smooth and non-bumpy, and other times there's not shake and the roads may or may not be in worse shape.

I've to stiff light duty truck tires on (Nankooks) which can be a rough ride on some roads (although the smoothest thing ever too on good roads) and I've sorta always thought the shake might be partly because the them, but, at this point I'm wondering.

There isn't play in the wheel, I think the tie rods are fine, are the bushings or something I should be looking at?

I have to admit I've never messed with steering issues, so I don't know where to start.

I should ad, I don't notice the vibration so much (at all? ) at slow speeds.

Thanks!

mark