SKYJACKER | JL40RBKLT | JL 3.5 in. Dual Rate-Long Travel Suspension Lift Kit
 
This system is built for Jeep owners who expect their rig to perform just as well on the road as it does on the trail.
At the core of this Skyjacker kit is a dual-rate, long-travel coil spring design—engineered to deliver a smooth, controlled highway ride while dramatically improving articulation and traction off-road.
Dual-Rate Coil Performance — Why It Matters
Unlike traditional single-rate springs, Skyjacker’s dual-rate coils work in two stages:
Primary Rate (Upper Coils):
Handles everyday driving—providing a comfortable, stable ride on pavement.
Secondary Rate (Lower Coils):
Engages under load and compression—delivering added control and stability when the suspension is working hard off-road.
When the suspension droops, the coils expand and stay seated properly, allowing the tires to maintain contact with the terrain longer. The result is better traction, smoother articulation, and more control in technical situations.
Complete System — Not Just a Lift
This isn’t just about height—it’s about doing it right.
 
The 3.5” system includes the critical components needed to maintain proper geometry, maximize travel, and keep your Jeep predictable and controlled:
Front & rear dual-rate long-travel coil springs
Front & rear long-travel shocks (length-matched for full articulation)
Front & rear extended sway bar end links (for proper droop)
Front & rear bump stop extensions (to prevent tire interference at full compression)
Front adjustable track bar (no pitman arm required)
Rear track bar relocation bracket (frame-mounted, Grade 8 hardware)
Front & rear eccentric cam alignment kits (D-bolts) for proper caster correction
 
Designed For
Jeep Wrangler JL 4-Door Rubicon models
 
Best Off-Road Take
This is a solid, well-rounded system for someone who wants a true improvement in both ride quality and trail performance—without jumping into a full coilover setup.
The dual-rate spring design is the real value here. You’ll notice:
A smoother ride on the road
Better control when things get rough
More usable articulation without the suspension feeling loose or unpredictable
If you're building a JL that sees regular trail use but still needs to drive well every day, this kit hits that sweet spot.