Tuff Country 14958KN 4" Lift Kit with Knuckles and 1 Piece Sub-Frame with SX8000 Shocks

Upgrade your GM heavy-duty pickup with the Tuff Country 14958KN 4" Lift Kit featuring knuckles, a one-piece sub-frame, and SX8000 shocks. Built for 2001–2004 Avalanche 2500 4WD, 2001–2006 Silverado 1500HD 4WD, and 2001–2006 GMC Sierra 1500HD 4WD, this bolt-on kit delivers a confident, capable stance and improved off-road performance.

• Lift Height: 4" front / 2" rear lift to increase ground clearance and accommodate larger tires.
• Knuckles & Sub-Frame: New steering knuckles eliminate the need to drop upper control arms; a single-piece sub-frame increases rigidity and reduces squeaks and rattles.
• Shocks Included: SX8000 shocks are included for balanced damping and improved control on rough terrain.
• Tire Compatibility: Designed to support up to 33" x 12.5" tires for a more commanding, aggressive look and enhanced traction.
• Vehicle Fitment: Fits 2001–2004 Chevy Avalanche 2500 4WD, 2001–2006 Chevy Silverado 1500HD 4WD, and 2001–2006 GMC Sierra 1500HD 4WD.
• Installation Notes: Simple bolt-on installation; factory length shocks must be replaced with extended shocks for proper fitment. Shocks and boots can be selected in the Options above if you have not purchased extended shocks.
• Warranty: Backed by a limited lifetime warranty from Tuff Country, reflecting 35+ years of suspension expertise.
• Important Fitment Considerations: Not compatible with Stabilitrak-equipped models; factory rims will not fit—use a rim with 4.5" back spacing or less.
• Install Time: Typical installation window is 8–10 hours with proper tools and alignment.

The 14958KN kit redefines your truck’s capabilities by delivering substantial front-end lift paired with strategic rear geometry, allowing larger tires to transform traction, articulation, and overall stance. The integrated knuckle and sub-frame design enhances chassis stiffness, reducing unwanted movement for a steadier ride both on and off pavement. SX8000 shocks provide a balanced, responsive feel, helping maintain control over uneven surfaces, potholes, and gravel. With a straightforward bolt-on approach and a robust 4" front/2" rear configuration, this kit is an excellent choice for owners seeking a durable, purpose-built lift that stands up to real-world use while maintaining long-term reliability and value.