For Ford F-150 1997-2003 2WD For Ford F-150 Lightning 1999-2003 2WD Chromium-silicon cold-wound structure with high tensile strength and resilience High tensile spring——600,000 times continuously test to assure its high tensile strength. Powder coating for corrosion resistance Increased Ground Clearance – help your vehicle handle bumps and other obstacles on the road better.