QA1 Coilover Overhaul Kit R146-200Product Overview If you're ready to move beyond stock leaf springs, QA1s rear suspension system is the upgrade your trucks been waiting for. Built specifically for 19992006 2WD Silverado and Sierra 1500s, its a major step up in traction, ride quality, and overall drivability. MORE TRACTION. NO BIND. BETTER STREET MANNERS The torque arm setup replaces your leaf springs with a true multi link system that eliminates bind, improves pinion angle control,