Rear Coilover Conversion System, 99-06 Silverado/Sierra 1500 2WD, Single Adjustable, Long Bed
QA1 #R146-200
 
If you're ready to move beyond stock leaf springs, QA1’s rear suspension system is the upgrade your truck’s been waiting for. Built specifically for 1999–2006 NBS 2WD Silverado and Sierra 1500s, it’s 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, and helps your truck put power down more effectively. This is the kind of upgrade that makes your truck feel planted and predictable.
DIAL IN YOUR RIDE WITH QA1 COIL-OVERS
Tailor the driving feel to your liking with QA1 single adjustable shocks. These shocks offer 18 clicks of combined compression and rebound adjustment to dial in a balance of performance and comfort. With up to 4"–7" of drop range, you can set the perfect stance while still enjoying a comfortable, confident ride.
BOLT-ON DESIGN WITH CROSSMEMBER REPLACEMENT
You won’t need a welder or fabrication shop to get this done. QA1 includes a bolt-in fuel tank crossmember that replaces the rust-prone factory piece while keeping your stock fuel tank and lines in place. The full system installs with basic hand tools and includes all the necessary hardware and instructions.
MADE IN THE USA
QA1's Torque Arm suspension is proudly made in Lakeville, Minnesota.
FEATURES & BENEFITS
Torque arm design eliminates bind and improves rear grip
Adjustable drop range from 4"–7" lower
Single adjustable coil-overs with 18 clicks of adjustment
Panhard bar helps maintain lateral alignment under load
Includes bolt-in fuel tank crossmember—no welding needed
Big upgrade in traction, ride comfort, and suspension control
Works great with QA1’s rear sway bar (sold separately)
Designed for easy installation with basic tools
Spanner wrench and thrust bearing included
Made in the USA
FITMENT NOTES 
Fits 1999–2006 NBS Chevrolet Silverado 1500 2WD – Long Bed Only
For use with 10 bolt axle only
Rear sway bar not included—available separately (Part Number: 52880)
Modification to exhaust required
Specifications
Spring Rate200lb/in.
Axle HousingGM 10 Bolt
Shock ValvingSingle Adjustable
Bed Length Long Bed