QA1 QA1 R903S 9in. Housing for 64-66 Mustang with QA1 4-Link R903s

Already running one of QA1’s 4-Link Suspension Kits on your classic Mustang? The QA1 9” rear housing is the perfect upgrade to handle more horsepower, improve durability, and simplify serviceability. Designed specifically to integrate with QA1’s 4-link systems, this housing delivers strength, precision, and a true bolt-on fit. ENHANCE YOUR EXISTING QA1 4-LINK QA1’s fabricated 9” rear housing bolts directly to QA1’s Mustang 4-link suspension systems. It features fully formed trailing arm brackets that minimize flex under heavy loads, improving suspension response and long-term reliability. Whether you’re stepping up to more power or building a street-driven restomod, this housing provides the durability and alignment precision you need – without custom fabrication. EASY INSTALLATION & SERVICEABILITY QA1’s bolt-on housing design eliminates the need for cutting, welding, or additional fabrication. The integrated jack pad, fill and drain plugs, and vent port make servicing simple and clean. If you already have a QA1 4-link system, this housing bolts in place for a seamless upgrade – perfect for any street, strip, or pro-touring build.