mi car is a 92 tauri 3.0, i have checked an replaced all tires, there is no sign of worn tie end rods either external or internal, only the steering wheel, with engine off, rotates freely about 10degrees before it makes an effort to turn the tires...
i tought that maybe it could be unbalanced tires, but they only vibrate when i step on the accel, because i have noticed on down hill the car barely vibrates, and i think is because the little bumps on the highway, but if i accel then the car shakes a lot then it keeps steady once it reachs 50-53 mph.
i dont think i loose a weigth, UnderE. but yes is slightly diferent wear on both tires.
on the other hand, SMC540 no i just replace both tie end rods, the external ones not the internal because they were perfect tight, not even a milimeter of movement... but i'll chek the balance again tought