2005 Thunderbird steering jerky, wandering, darty

[alabamafrog]

I’m having issues with a 2005 50 anniversary Ford Thunderbird
I got 2 problems and I have no idea if they are related or totally independent
First, It makes a squeaking noise when turning the wheel especially when maneuvering to park, it almost sounds like a bushing or plastic rubbing just under the steering wheel but it also has a strange “rough” feel that is very faint but there.
Second problem is the thing is very “darty” at high speeds, its down right dangerous to drive. When you get on or off the throttle it lunges left or right and when you hit the slightest dip, bump, or groove in the road it will jump left or right. I noticed today that at 60 mph holding the wheel as still as I could it seemed like it was constantly adjusting itself left and right. Its hard to nail down the feel and problem. At low speeds everything feels fine, the faster you go the worse it gets and it seems to be worse every time I drive it.
We have replaced all the front and rear linkages and stabilizers and sway bars and such. It has new tires and has been 4 wheel aligned twice. But the problem just seems to keep getting steadily worse.
Now Im thinking it needs a new rack and pinion
What do yall think?

[Bsr26]

I was suffering from the same exact thing years ago in my 94. Needed a new rack and bushing up front were completely shot if I recall correctly. Also check the bushing for the rear hub assembly. Mine were so bad the mechanic was able to turn the rear wheels side to side... Good luck!