Description
Upgrade your Jeep TJ Wrangler Unlimited (LJ) with the RockJock Sport Edition Johnny Joint Suspension System, a high-quality suspension lift kit engineered to deliver approximately 4 inches of lift and clearance for up to 35-inch tires when combined with a 1-inch body lift and a 1-inch motor mount lift (or aftermarket high-clearance fenders). This Jeep LJ suspension system is designed to improve capability, stability, and overall performance for drivers who want a balanced upgrade for both street and off-road use.
Built with premium components focused on strength, fit, finish, and function, the Sport Edition Johnny Joint system delivers dependable performance for Jeep owners looking to enhance their vehicle without going to a full competition-level setup. It provides improved articulation, increased ground clearance, and a more capable suspension platform for weekend trail driving and moderate off-road use.
Designed as a complete bolt-on suspension lift kit for the 1997–2006 Jeep TJ Wrangler Unlimited (LJ), this system offers an excellent balance between ride quality and off-road capability, making it ideal for drivers who want to run larger tires and explore intermediate trails with confidence.
For Jeep enthusiasts planning more advanced off-road builds, RockJock offers a range of upgrade components that can be added to this system, allowing you to progressively enhance performance as your off-road needs grow. This makes the Sport Edition Johnny Joint Suspension System a strong foundation for a scalable Jeep LJ suspension upgrade path.
Kit Fits:
- TJ Wrangler Unlimited (LJ) – All Models
Kit Includes:
- 4 in. Lift Dual-Rate Front And Rear Springs
- Johnny Joint Double Adjustable Front Upper Control Arms
- Johnny Joint Double Adjustable Rear Upper Control Arms
- Johnny Joint Adjustable Front Trac Bar
- Rear Trac Bar Geometry Correction Bracket
- Front and Rear Bump Stop Kits
- Front Sway Bar Disconnects
- All Required Hardware
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 TJ’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.
- Johnny Joint Trac Bar – Heavy duty trac bar included is our adjustable length chromoly unit. Our trac bar combines a precise fit with increased strength and adjustable length to perfectly center front axle under the vehicle. High-articulation Johnny Joint ends provide maximum durability and suspension flex.
Optional Add-On Components – Add-on components enable the RockJock Pro Edition Suspension Lift to be customized for increased off-road capabilities and tuning.
- Antirock Sway Bars – Antirocks allow for maximum suspension articulation while providing maximum 4 wheel traction.
- Currectlync Steering System – For maximum strength, reliability and confidence off-road, upgrade your steering!
- Axle Housing Johnny Joints – Adding this simple kit to your Sport Edition Suspension System converts 2 more pivoting points in your suspension to high articulation Johnny Joint rod ends.
- Johnny Joint Adjustable Rear Trac Bar – Adds 2 more Johnny Jointed points for maximum articulation and allows adjustability for perfect alignment. This component is mandatory if you are retaining your stock driveshaft! See notes below.
- Shock Packages – Select from a range of performance shocks with race-proven technology from Rancho and King to meet your requirements.
- Rear Shock Relocation Brackets – Recommended for use when using this suspension kit in conjunction with a factory differential to push the lower shock mounting location back outward to an accessible location.
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:
- 33 in. tires – no other vehicle modification necessary
- 35 in. tires – 1 in. Body Lift and a 1 in. Motor Mount Lift or aftermarket fenders, high-clearance fenders required
- Larger Than 35 in. Tires – we have found provide diminishing return without dramatic modifications to the vehicle
Wheel Backspace:
- 4.5 in. wheel backspace is recommended for all tire sizes
**IMPORTANT**:
- The CE-9121N rear trac bar geometry correction bracket included in this kit is intended for use in conjunction with a transfer case tail shaft slip yoke eliminator kit and a double cardan driveshaft.
- The tail shaft slip yoke eliminator kit we recommend is from Tom Wood’s Driveline. They can also supply the double cardan driveshaft!
- If you’ll be retaining your stock driveshaft, our CE-9120RS Johnny Joint rear trac bar becomes mandatory.
