[Shotimes] HELP: Jitter at steering wheel, major car shake now

[Al&Angela]

Hello,

 

I just want to run this by you guys.

 

---A week ago---

My 94 SHO ATX w/ 137K mls has steering wheel jitter at low speeds (under 45
mph) but the wheel is very solid and steady at high speeds.

When I let go the wheel at low speeds the car stays straight but the wheel
jitters left to right, not a whole lot, perhaps .5 to 1 inch.

When I had the car off the ground I tried moving the front wheels (top and
bottom) vertically, there was no play.

 

---Today---

The car has gotten worse.  It has a study vibration at highway speeds.

At very slow speeds 10mph when coming to a stop the car shakes slowly side
to side.

 

Is the steering box going bad? I checked the lug nuts on the car and they
are tight.

 

Thanks for your advice

 

a.

 

PS: This sounds expensive :-)