Product Description:
QA1 4-6” Lowering Kit w/ Spindles – Double Adjustable | 2007–2016 Silverado / Sierra 1500 4WD
Complete front and rear suspension system designed to deliver an aggressive lowered stance while maintaining proper suspension geometry, ride quality, and full adjustability on 4WD trucks.
✔ Want a more budget-friendly option? Check out the Single Adjustable version (LK11).
✔ 3–5” Front Drop (Includes Spindles)
✔ Double Adjustable Shocks (Compression & Rebound)
✔ Designed for 4WD Trucks
✔ Complete Front & Rear System
✔ Includes drop spindles for increased front drop and improved ride quality compared to coilover-only kits.
Performance & Ride Quality
QA1 Pro Coil system delivers significant improvements in handling, ride comfort, and overall suspension control, with independent rebound and compression adjustment for precise tuning. :contentReference[oaicite:0]{index=0}
Ride Height Range
Front: 3–5” drop (with included spindles)
Rear: 4–6” drop with ½” incremental adjustment :contentReference[oaicite:1]{index=1}
Heavy-Duty Design
Engineered for truck applications with upgraded shocks, polyurethane bushings, and a 1” chromoly T-bar to support vehicle weight and long-term durability. :contentReference[oaicite:2]{index=2}
Rear Drop System
Includes heavy-duty shackles and hangers made from powder-coated steel for strength, corrosion resistance, and long-lasting performance. :contentReference[oaicite:3]{index=3}
Installation
Fully bolt-in system designed for straightforward installation with no cutting or fabrication required. :contentReference[oaicite:4]{index=4}
Warranty
Backed by QA1’s lifetime warranty (registration required).
Fitment Notes
Only compatible with trucks that have factory Cast Steel control arms.
- Direct fit for 2007-2013 trucks
- Only compatible with 2014 to 2016 trucks using Cast Steel control arms. Will NOT work on 2014 to 2016 trucks with aluminum or stamped steel control arms.
- Must be used with 17" minimum diameter wheels
- Axle U-bolts not included
- Does not fit 1500HD model trucks or 2007 Silverado/Sierra 1500 Classic
- Offset upper control arm bushings (AcDelco PN 45K0201) may be required on vehicles lowered more the 2.5” to align within the factory specifications.
Specifications
| Kit Type | Lowering Kit |
| Drivetrain | 4WD |
| Shock Valving | Double Adjustable |
| Includes Drop Spindles | Yes |
| Emission Code | 4 |
| Prop 65 Warning | Yes |
