Ez-990 Helper Spring

The HELLWIG Ez-990 Helper Spring is a load-support solution designed for vehicles that regularly carry heavy cargo, tow trailers, or experience sagging rear suspension under weight. As a mechanic, I've found that helper springs address a critical gap in OEM suspension geometry: factory springs are engineered for average driving conditions, not peak load scenarios. This auxiliary spring nestles alongside your existing coil springs to restore ride height and maintain proper suspension geometry when your vehicle is at maximum capacity—preventing bottoming-out, tire wear, and handling degradation that heavy loads create.

HELLWIG's Ez-990 uses a precision-wound coil design engineered to engage only when suspension compression reaches typical load thresholds, meaning it remains dormant during unloaded driving and delivers a progressive support curve as weight increases. The 21.8 lb spring is constructed from high-carbon steel with a protective coating to resist corrosion and fatigue cycling. Its 44.6-inch length accommodates most mid-to-full-size truck and SUV applications, while the compact 8 x 3-inch profile allows straightforward installation alongside factory coils without frame modifications or complex welding.

Truck owners, contractors, and RV enthusiasts benefit most from Ez-990 installation, particularly those who regularly max payload capacity or operate near GVWR limits. Installation is bolt-on, requiring no fabrication; the spring mounts between the frame and factory coil using existing suspension contact points. Before purchase, verify your vehicle's suspension design—independent rear setups differ from solid-axle trucks—and confirm ride height specifications to ensure proper load-leveling performance and maintain manufacturer warranty compliance on suspension components.