“Solid-axle-equipped Mustangs were manufactured with a four-link rear suspension design that requires the rear upper control arms to do two jobs. One job is to locate the axle laterally. Unfortunately, compromises in the design of the Mustang four-link prevent the rear axle from being precisely located. The axle will shift from side-to-side by up to 2 inches. This inconsistent movement of the rear axle causes a rear-steer effect.”
And yet again Ford astounds me with their befuddlingly godawful engineering. No other make of automobile has had me standing, arms outstretched, exclaiming “What the fuck?” more than the Fords I’ve worked on.