Naturally, you could build a super-expensive solid axle OR a budget-friendly IRS. But when you’re comparing apples to apples — similar power or similar performance goals — an equivalent solid rear axle is going to be cheaper than an IRS. Why? Fewer parts. As we’ve discussed, you’ve essentially got a 4-link rear suspension with trailing arms, shocks, springs, axles, a rear diff, and maybe a Watts link. As you can see from the Steeda Foxbody Pro Action adjustable rear shocks on a Foxbody Mustang, it’s pretty simple back there.
An IRS has a lot more individual components and adjustments and bushings, making a build or replacement more expensive.
Michael S. Palmer began his career assisting and developing content for Academy Award-winning and studio-based film and television producers. He has been a professional writer since 2008, when he joined the Writers Guild of America West (WGAw). As a journalist and Content Editor/Manager, he has covered numerous emerging imaging, theatrical exhibition, home entertainment, and automotive technologies. He currently spends his days creating original content at the Internet Brands Automotive Group for some of the world's largest online automotive communities, including Ford Truck Enthusiasts, CorvetteForum, ClubLexus, AudiWorld, and LS1Tech. He still owns his first car, a 1987 Mercury Cougar; adores driving his Boss 302 Mustang; and recently teamed with Chevrolet Performance, Holley, Magnaflow, Eaton, Wilwood, Michelin, Chemical Guys, Summit Racing to build his first project car. Installing an LS3 E-ROD Connect & Cruise system into a 1992 Buick Roadmaster Estate Wagon made his eight-passenger wagon faster than a C5 Corvette to 60mph and 50 state emissions legal. His wife and daughter are very patient.
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