I would venture a guess that the shorter the arm, the more the bump steer. Correct? Geometry and how long or how short the arm is (shorter being more responsive) would determine this. Since there has always been some bump steer in Falcons and Mustangs with the stock arms, and considering (from my crude measuring of images on a computer screen) that the Granada arms are shorter (both decreasing the overall turning radius and being more responsive too) they would because of that increase the bump steer.
If the rack just doesn't give you the movement to go from stop-to-stop (internally) as much as the stock steering box did, then adding a shorter arm would decrease the turning radius at the risk of additional bump steer.
Did I surmise this correctly?
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