6" 2001-2006 GMC Sierra 1500HD 4WD Lift Kit (w/rear leaf springs) by Skyjacker

The Skyjacker C9651HKS 6-Inch Suspension Lift Kit for 2001-2006 GMC Sierra 1500HD 4WD models is a complete heavy-duty suspension system that increases ground clearance, adds tire clearance, and maintains proper suspension geometry at the taller ride height. The system combines replacement steering knuckles, heavy-duty front and rear crossmembers, torsion bar drop brackets, bump stop brackets, a differential skid plate, 6-inch Skyjacker Softride replacement rear leaf springs, U-bolts, and supporting hardware. Shock options include Skyjacker Hydro 7000, Nitro 8000, M95 Performance, or BlackMAX shocks.

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. Torsion bar drop brackets relocate the factory torsion bar system to work with the taller suspension, while bump stop brackets help maintain proper compression control as the suspension cycles. The included differential skid plate protects critical front drivetrain components and integrates with the crossmember-based suspension layout to provide a strong foundation for lifted Sierra 1500HD applications.

Unlike the block-equipped C9651HK configuration, the C9651HKS uses Skyjacker Softride replacement rear leaf springs to increase rear ride height. The full replacement spring configuration provides a more complete rear suspension upgrade while supporting controlled suspension movement and articulation. Softride leaf springs are engineered to provide the height required to complement the 6-inch front suspension while maintaining predictable road manners and durability for street and off-road use. Combined with the front suspension relocation system, the replacement rear springs create a balanced 6-inch lifted stance with clearance for larger wheel and tire combinations.

The C9651HKS is available with four Skyjacker shock configurations. Hydro 7000 shocks use velocity-sensitive hydraulic damping for smooth, predictable suspension response on everyday street and trail rides. Nitro 8000 shocks use a 150 PSI gas charge for firmer, more responsive damping and increased suspension control. BlackMAX shocks feature foam-cell hydraulic technology for consistent damping without a high-pressure gas charge, while M95 Performance shocks use a 200 PSI monotube internal floating piston design with a large 46mm bore for responsive damping, improved heat management, and consistent performance during more demanding driving conditions.

Features & Benefits

• Provides approximately 6 inches of suspension lift for increased ground clearance and tire clearance
• Designed for 2001-2006 GMC Sierra 1500HD 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
• Differential skid plate provides additional protection for critical front drivetrain components
• Includes Skyjacker Softride replacement rear leaf springs
• Replacement rear leaf springs provide the rear lift without relying on large lift blocks for primary ride height
• Softride rear spring design supports controlled ride quality and suspension articulation
• Full replacement rear spring configuration creates a complete front-to-rear suspension upgrade
• Includes rear U-bolts for the replacement leaf spring configuration
• Creates a balanced 6-inch lifted stance with additional room for larger wheel and tire combinations
• 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 monotube internal floating piston design with a large 46mm bore for consistent damping and improved heat management
• Multiple shock configurations allow the suspension system to be matched to different ride characteristics and performance demands