Steering wheel shakes, Need to pick ur knowledge Options

[SUNAB914]

Ok, 74 that has steering wheel shaking when reaching speeds of 55mph or more. I have changed the tie rods, struts, ball joints are good although I have new ones standing by. Front wheels are getting eaten on inside of tire. I wasn't able to check alignment due to the alignment tool was broken at the place I went, but they will have a new one in the next few days. I will take it back to recheck. Everything is tight and can't figure out why it is doing this, so far. Before I left we, rotated rear tires up front, but it still has the shaking, not as bad but there. Tires are dead on balanced and they are new. 4000 miles on on four.
What do I look for next?
Thanks for your input.

[Dave_Darling]

Wear on the inside edges == toe-out. Probably combined with negative camber. Toe-out is EVIL and should be AVOIDED unless you put just a tiny amount on the front of your autoXer to help initial turn-in. And you know that you can never take your attention off of driving, even for an instant.

Shimmy can be a lot of things, from bushings to bearings to a bent wheel to a tire de-laminating to wheel/tire balance problems...

Fix the alignment. Since the shimmy got better (but not cured) when you swapped wheels front-to-rear, chances are very high that the rear wheels or tires are to blame for it. Have their balance double-checked, then inspect the wheels carefully. If that doesn't fix/show the problem, replace the rear tires.

--DD