hen it comes to suspension design there’s a reason many high-end luxury and performance cars have independent rear suspension: it’s the simple fact that an IRS rides and handles far better than a solid axle. Like many classic truck enthusiasts, Paul Willis wanted to improve the ride and handling of his ’55 Ford F-100 with an IRS update, but the heart-stopping cost of the aftermarket designs put such a swap out of reach. That was before he learned of Don McNeil’s Flat Out
