RockJock's Sport Edition Johnny Joint Suspension System for JK Wranglers provides 4 inches of lift and allows for efficient clearance of up to 37 in. tall tires (larger tires will require aftermarket fenders and minor trimming)!
Comprised of only the highest end components in the areas of strength, fit, finish, function, and the engineering to back them, this kit is more than sufficient for those who want to lift their vehicle, install big tires and hit some intermediate trails on the weekend!
For those who intend to do more serious 4 wheeling and rock crawling, you'll want to look at all of the upgrade parts that RockJock has to offer that can be added to this kit to get your vehicle to it's full potential at any level of off-roading!

Kit Fits:

• JK Wrangler (2-door) – All Models

Kit Includes:

• 4 in. Lift Dual-Rate Front And Rear Springs
• Johnny Joint Adjustable Front Upper Control Arms
• Johnny Joint Adjustable Rear Upper Control Arms
• Front and Rear Trac Bar Geometry Correction Brackets
• Front and Rear Bump Stop Kits
• Rear Adjustable Sway Bar Links w/ Sealed Ends
• Front and Rear Brake Line Relocation Brackets

Kit Features:

• RockJock Spec. Dual-Rate Springs - Feature a soft initial rate that absorbs small bumps and trail chop, to deliver a smooth, comfortable ride, while a firmer secondary rate helps soak up larger impacts and reduce bottoming. A key differentiator of RockJock spec. dual-rate springs is the positioning of the crossover point between the initial and secondary spring rates so that a portion of the softer initial rate is available and active at ride height before crossing over to the firmer secondary rate deeper into the travel.
• Bump Stop Spacers - Proper bump stop extensions are a must and our heavy duty kits stand up to hard use while keeping the tires off of your JK’s fenders!
• Johnny Joint Control Arms – Heavy duty adjustable upper control arms feature RockJock Johnny Joints, the original and most durable high-articulation urethane suspension joint on the market. Johnny Joints feature a smooth steel ball that pivots inside a proprietary urethane shell to provide over 30 degrees (per joint) of quiet, shock dampening articulation - without the excessive deflection found in soft rubber-based flex joints. Johnny Joints are so trusted, that they are used by multiple commercial suspension companies, for both street and off-road suspension systems. 
• Trac Bar Relocation Brackets - Restore front and rear suspension lateral geometry and produce better overall vehicle handling by raising the suspension roll center to bring it closer to the vehicle’s center of gravity.

Lift Details - The RockJock Suspension System provides 4 in. of suspension lift.

• Actual lift height may vary due to factory build specs. and added equipment and accessories.

Tire Fitment:

• 37 in. tires – no inner fender modification necessary
• 38 in. or larger tires – aftermarket high-clearance fenders suggested/required

Wheel Backspace:

• 4.5 in. wheel backspace is recommended for all tire sizes