Jeep Wrangler JK 4-Door 3.5-4 Inch Dual Rate Long Travel Lift Kit, One Box kit include Front & Rear Black Max Shocks, Adjustable Front Track Bar, Rear Track Bar relocation, Caster Cam Bolts, Softride OEM Spring rate Coil Spring lift, No lower Arms, No Pitman Arm drop required, Bumpstop relocations, Brakeline bracket. FMVSS126 Safety Compliant. Dual-rate Long Travel Coils maintain coil in bucket at full droop, Maximizes Articulation, Higher Strength Alloy over competitors prevents sagging, fractures and allows for powder coating in the OEM coils for superb ride quality, Individual Rear Spring rates Left & Right side same as OEM.