6" 1999-2006 GMC Sierra 1500 4WD Lift Kit by Skyjacker

The Skyjacker C9661K-NSP 6-Inch Suspension Lift Kit for 1999-2006 GMC Sierra 1500 4WD models is a complete suspension system that delivers substantial ground clearance, increased tire clearance, and corrected suspension geometry at a taller ride height. The system combines replacement steering knuckles, heavy-duty front and rear crossmembers, torsion bar drop brackets, front bump stop brackets, rear add-a-leafs, rear lift blocks, U-bolts, and supporting suspension hardware. Shock options include Skyjacker Hydro 7000, Nitro 8000, M95 Performance, or BlackMAX shocks, letting you configure the system for different ride characteristics and performance needs.

The front suspension uses application-specific replacement steering knuckles and heavy-duty crossmembers to reposition critical suspension mounting points for the 6-inch increase in ride height. The front and rear crossmembers relocate factory suspension mounting points while providing a strong structural foundation for the lifted front end. Torsion bar drop brackets reposition the factory torsion bar system to work with the increased suspension height, while dedicated bump stop brackets help maintain proper compression control as the suspension moves through its travel.

At the rear, Skyjacker add-a-leafs work with lift blocks and longer U-bolts to increase ride height while retaining the factory leaf spring packs. The add-a-leafs increase spring support and contribute to the overall rear lift, while the block system provides the additional height needed to complement the raised front suspension. This front-to-rear configuration delivers a balanced 6-inch lift and clearance for up to 35x12.50 tires with properly configured wheels, making the C9661K-NSP well suited for Sierra builds focused on increased ground clearance, larger tires, and improved off-road capability.

The C9661K-NSP is available with four Skyjacker shock configurations. Hydro 7000 shocks use velocity-sensitive hydraulic damping for smooth, predictable suspension control on everyday street and trail rides. Nitro 8000 shocks use a 150 PSI gas charge for firmer, more responsive damping and improved control over changing terrain. BlackMAX shocks feature advanced foam-cell hydraulic technology for consistent damping without a high-pressure gas charge, while M95 Performance shocks use a 200 PSI gas-charged monotube internal floating piston design for responsive damping, consistent control, and improved heat management during more demanding driving conditions.

Features & Benefits

• Provides approximately 6 inches of suspension lift for increased ground clearance and tire clearance
• Designed for 1999-2006 GMC Sierra 1500 4WD models
• Replacement steering knuckles help maintain proper steering geometry at the increased ride height
• Heavy-duty front and rear crossmembers relocate critical suspension mounting points
• Crossmember system provides a strong structural foundation for the lifted front suspension
• Torsion bar drop brackets reposition the factory torsion bar system for the taller suspension
• Front bump stop brackets help maintain proper compression control throughout suspension travel
• Rear add-a-leafs work with the factory leaf springs to increase rear ride height and spring support
• Rear lift blocks provide additional height to complement the 6-inch front suspension lift
• Includes longer rear U-bolts for the lifted leaf-spring configuration
• Front and rear suspension components create a balanced lifted stance
• Provides clearance for up to 35x12.50 tires with properly configured wheels
• Available with Skyjacker Hydro 7000 hydraulic shocks
• Hydro 7000 shocks use velocity-sensitive hydraulic damping for smooth and predictable suspension response
• Available with Skyjacker Nitro 8000 gas-charged shocks
• Nitro 8000 shocks use a 150 PSI gas charge for firm and responsive suspension control
• Available with Skyjacker BlackMAX foam-cell hydraulic shocks
• BlackMAX shocks provide consistent hydraulic damping for balanced street and trail performance
• Available with Skyjacker M95 Performance monotube shocks
• M95 shocks use a 200 PSI gas-charged monotube internal floating piston design for consistent damping and improved heat management
• Multiple shock configurations allow the suspension system to be matched to different ride characteristics and performance demands