SuperSprings SSR-610-40 SumoSprings Rear Helper Spring Assembly

The SSR-610-40 SumoSprings are a patented one-piece micro-cellular polyurethane foam helper spring designed as a direct bolt-on replacement for factory rear bump stops. They utilize a proprietary closed-cell urethane structure capturing millions of air bubbles to deliver a smooth, progressive spring rate with superior damping properties. The Blue -40 density variant is engineered for light and medium-duty applications, providing 1,000 lb load support at 50% compression while maintaining full memory rebound up to 70% compression. The kit requires no airlines, compressors, or drilling for installation, typically completing in one hour. They enhance load carrying ability, stabilize sway, reduce sag, and improve driver control without affecting unloaded ride quality. Material composition consists of high-resilience micro-cellular polyurethane resistant to leakage, rupture, and environmental degradation. The assembly includes left and right units with mounting hardware. Cross-reference compatibility extends to alternative density variants SSR-610-47 (Black, -47 density) and SSR-610-54 (Yellow, -54 density) for heavier load requirements. Primary applications cover Toyota Tacoma (2005-2015), Toyota Tundra (2000-2021), Toyota Hilux/Vigo (2005-2015), Nissan Frontier (2005-2015), and Nissan Titan (2004-2015) across 2WD and 4WD configurations.