Symptom: Car ('92 300E w/ 185,000 mi) feels like its constantly driving through a stiff crosswind getting buffeting left and right. This happens above 40 mph. When passing trucks on the hwy, feels like I'm in a microcar.

Background: Front & rear shocks with strut mounts were replaced over the summer with Sachs. 4 wheel alignment done after left tie-end rod replaced with MB part. Three months later, symptom as described above was observed. Took the car for alignment at another shop that is an authorized Kleeman dealer. Aligned and reported that toe spec was off. Car tracked excellent. Now, two months later car has that "wandering" feeling again at hwy speeds.

What would cause alignment (done at reputable shops) of go out of spec twice within 2-3 months of the alignment? Should the initial replacement of only one (left) tie-end rod have been done as a pair? Thanks in advance for your words of wisdom.

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ARVY

1999 E430
1999 C230 Kompressor
1992 300E (write-off)
1984 190D 2.2 (sold)