i was always under the impression the point of the wishbone was to eliminate the need for a tracbar and keep the housing centered while allowing for up/down travel
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depending on the angle it is mounted it at it could certianly induce some form of triangulating behavior between the upper and lower arms making some form of quasi ladder bar reaction.
I don't know though. Would require alot of plotting and a much better understanding of the mustang geometery. Of which admitedly, I have a poor understanding of the stock mustang geometery.