Description
Upgrade your Jeep TJ Wrangler Unlimited (LJ) with the RockJock Pro Edition Johnny Joint Suspension System, a complete high-performance suspension lift kit engineered for maximum strength, articulation, and off-road capability. Designed to deliver approximately 4 inches of lift, this system provides clearance for up to 35-inch tires when paired with a 1-inch body lift and a 1-inch motor mount lift (or aftermarket high-clearance fenders).
Built for serious off-road enthusiasts, this premium Jeep LJ suspension lift kit combines the highest-quality components in strength, fit, finish, and function. Every element is engineered for durability and performance, backed by RockJock’s proven suspension design expertise.
The Johnny Joint suspension system is designed to improve both on-road comfort and off-road capability, delivering a smooth, controlled ride on pavement while maximizing articulation and stability on the trail. This makes it an ideal upgrade for Jeep LJ owners who demand both daily drivability and extreme off-road performance.
As a complete direct bolt-on suspension system, installation is straightforward with no cutting or major fabrication required. The kit is purpose-built for enthusiasts who want to run larger tires, increase ground clearance, and confidently tackle challenging off-road terrain.
Perfect for rock crawling, overlanding, and aggressive trail use, the RockJock Pro Edition Johnny Joint Suspension System transforms the Jeep TJ Wrangler Unlimited (LJ) into a highly capable off-road platform ready for the toughest trails in the country.
Kit Fits:
- TJ Wrangler Unlimited (LJ) – All Models
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 Bars – Heavy duty trac bars included are our adjustable length chromoly front and rear units. Our trac bars combine a precise fit with increased strength and adjustable length to perfectly center front and rear axles 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 Pro Edition Suspension System converts 2 more pivoting points in your suspension to high articulation Johnny Joint rod ends.
- 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
**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.
