The drag link can affect the steering-wheel center, but not the alignment. If you get it together and the steering wheel is off-center when driving straight and level, your drag link is slightly longer/shorter than the previous one and this can be corrected by changing the tie-rod adjustment. Turning both tie-rods the exact same amount (shortening one and lengthing the other exactly the same amount) should in theory not affect the alignment / toe.

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Gone to the dark side

- Jeff