So you're saying the tie rods fixed a high speed shudder. Did the steering wheel rock back and forth with a slight clicking sound?
I get that on my car on occasion, I thought it was warped rotors.
Back to your issue - I assume you had an alignment at a quality shop?
97 T-Bird LX 4.6 - 80k miles
94 Supra TT Auto - street/strip car
04 CVPI- Brenda's car - 76k miles
95 T-Bird LX 4.6 - fully optioned, owned 15 years, 220k miles
96 Cougar XR-7 4.6- Brenda's car, owned 11 years, 187k miles
88 T-Bird 3.8 - first T-Bird, owned 5 years, 206k miles