Skyjacker Suspension YJ40FSB Softride Leaf Spring - 4-Inch

The Skyjacker Suspension YJ40FSB Softride leaf spring delivers a 4-inch lift with exceptional ride quality and durability. Engineered specifically for Jeep Wrangler YJ applications, this single leaf spring is constructed from premium American steel and features advanced manufacturing techniques for superior performance both on and off-road.

Advanced Shot-Peening Process:

Each individual leaf undergoes a precision shot-peening process where hard steel pellets are blasted at the surface at extremely high velocities. This compresses the steel's surface layer, significantly increasing tensile strength and fatigue resistance. This critical process enables maximum wheel travel and superior ride quality while extending spring life far beyond conventional designs.

Key Features:

• 4-inch lift height for improved ground clearance and larger tire fitment
• Bolt-style spring clips eliminate friction and binding for smoother articulation
• Full-length leaf tapering distributes loads evenly across the entire spring
• Reduced inter-leaf friction prevents digging and premature wear
• 100% American steel construction for consistent quality
• Enhanced flex characteristics at leaf ends for improved wheel travel

Unlike inferior springs that use cinch-style bend clips that create binding and restrict movement, Skyjacker's bolt-style clips allow the leaves to move freely during compression and extension. The tapered leaf design spreads stress over a greater surface area, reducing stress concentration points and the tendency for leaves to dig into one another during articulation.