Rock Krawler F2AS4006 4.0-Inch Adventure Series Suspension Lift System

The Rock Krawler F2AS4006 is a 4.0-inch Adventure Series Suspension System engineered for Ford Super Duty trucks seeking a complete, bolt-in lift solution that improves both on-road ride quality and off-road capability.

The "Adventure Series" designation reflects the use of Rock Krawler's 100% service-free Adventure Series joints installed at each end of the control arms, delivering significant misalignment capability and reducing the inherent bind found in factory control arms.

Key Features:

• 4.0-inch lift for increased ground clearance and larger tire fitment
• Adventure Series service-free joints — no greasing required
• Non-adjustable control arms with Adventure Series joints at frame and axle connection points
• Triple-rate coil springs engineered for an improved on-road comfort over OEM linear-rate springs
• Coil springs built with proper free-length for off-road articulation and consistent coil bucket seating
• Track bar geometry corrections (front and rear) for precise axle centering without compromising on-road handling
• Correction pads included to reduce factory spring bow
• Designed as a comprehensive, complete system for straightforward installation

Rock Krawler's goal with the Adventure Series is to deliver the most comprehensive suspension solution with optimized geometry — equally capable on city streets, highway towing, and challenging trails.