Product Description:
QA1 4-6” Lowering Kit w/ Spindles – 4WD Silverado / Sierra 1500
Complete front and rear suspension system designed to deliver an aggressive lowered stance while maintaining proper suspension geometry and ride quality on 4WD trucks.
? Want maximum performance and tuning control? Upgrade to the Double Adjustable version (LK12).
✔ 3–5” Front Drop (Includes Spindles)
✔ Single Adjustable Shocks
✔ 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 improves ride quality while allowing rebound adjustment to fine-tune comfort and handling for daily driving.
Ride Height Range
Front: 3–5” drop (with included spindles)
Rear: 4–6” drop with ½” incremental adjustment
Heavy-Duty Design
Built for truck applications with upgraded shocks, polyurethane bushings, and a 1” chromoly T-bar for strength and durability.
Rear Drop System
Includes heavy-duty shackles and hangers constructed from powder-coated steel for long-term reliability.
Installation
Fully bolt-in system designed for straightforward installation.
Warranty
Backed by QA1’s lifetime warranty (registration required).
Fitment Notes
-
Axle U-bolts not included
Does not fit 1500HD model trucks
Offset upper control arm bushings (AcDelco PN 45K0201) may be required on vehicles lowered more the 2.5” to align within the factory specifications.Spindle Fitment Notes
When purchasing kits with drop spindles, the factory control arm construction must be verified to order the correct corresponding kit. Trucks will either utilize cast steel, aluminum, or stamped steel control arms. Kits not utilizing drop spindles will work within all year ranges and control arm types.
- Trucks from 2007-2016 that came from factory with Cast Steel control arms will require minimum of 17" diameter wheels.
- Trucks from 2014-2018 that came from factory with Aluminum OR Stamped Steel control arms will require minimum of 18" diameter wheels.
Specifications
| Kit Type | Lowering Kit |
| Drivetrain | 4WD |
| Shock Valving | Single Adjustable |
| Includes Drop Spindles | Yes |
| Emission Code | 4 |
| Prop 65 Warning | Yes |
