Prothane 4-106 Torsion Bar Crossmember Mount Body Bushing Kit 1973-1979

Prothane

<h3>About Prothane: The Standard in Performance Urethane</h3><p>When factory rubber bushings and mounts start to degrade, they rob your vehicle of handling precision, alignment stability, and ride quality. <strong>Prothane</strong> was built to solve exactly that problem. Founded by car racers and enthusiasts who understood firsthand the consequences of worn, spongy suspension components, Prothane launched in 1991 with a focused mission: replace OEM rubber with purpose-engineered polyurethane that outperforms, outlasts, and outhandles the competition.</p><p>Over the past three decades, Prothane has grown from a catalog of fewer than 100 part numbers into one of the most comprehensive urethane component suppliers in the industry, now offering over 10,000 distinct part numbers. Every product is proudly manufactured in the USA, and each one is backed by a lifetime warranty — a reflection of the company&apos;s confidence in its proprietary urethane formulations and precision engineering processes. Prothane even includes its own specially formulated &quot;Super Grease&quot; with parts that require lubrication, ensuring long-term, squeak-free operation right from installation.</p><h3>Why Urethane Outperforms Rubber</h3><p>OEM rubber bushings and mounts are engineered for a comfortable, quiet factory ride, but they carry a significant trade-off: they deteriorate rapidly under heat, UV exposure, road grime, oil, and the repeated stress of performance driving. Prothane&apos;s urethane compound is impervious to these elements, maintaining its shape and firmness for the life of the vehicle. The result is tighter handling, more consistent wheel alignment, reduced body roll, and better overall vehicle response — whether you&apos;re on a winding canyon road, a race track, or a rough off-road trail.</p><p>Prothane engineers use 3D CAD design tools to tailor each part to the exact specifications of a given vehicle application, ensuring a proper fit and the right balance of rigidity and compliance for that specific use case. Available in both classic red and black, Prothane bushings offer the same durometer and performance characteristics regardless of color choice.</p><h3>Prothane&apos;s Top Product Categories</h3><p>Prothane&apos;s lineup covers every major bushing and mount position on a car or truck. Among the most popular are <a href="/556-prothane-body-mount-set-10686">Body Mount Sets</a>, which replace the full complement of factory rubber body-to-frame isolators with durable polyurethane to restore and permanently maintain chassis alignment. For a comprehensive suspension overhaul, <a href="/556-prothane-suspension-bushing-kit-16059">Suspension Bushing Kits</a> bundle all the polyurethane bushings needed to transform a vehicle&apos;s handling geometry in a single purchase — covering control arms, sway bars, leaf springs, and more. Individual <a href="/556-prothane-body-mount-17005">Body Mounts</a> are also available for targeted replacements, making it easy to address a specific mounting point without replacing the entire set.</p><p>Whether you&apos;re restoring a classic American muscle car, building a lifted truck, upgrading a daily driver, or preparing a track car, Prothane manufactures a urethane solution for it — covering domestic, Asian, and European vehicles alike. With a lifetime warranty on every part and over 30 years of real-world validation behind the brand, Prothane remains the go-to choice for enthusiasts and professional builders who refuse to compromise on suspension performance.</p>