Suspension and Components› Suspension Kits

Rock Jock

Pro Edition Johnny Joint Suspension System for LJ 4 Inch lift RockJock 4X4

$3,510.60

SKU: R01U RJ-LJ0001-101

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INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

Part #: RJ-LJ0001-101

RockJock's Pro Edition Johnny Joint Suspension System for LJ Unlimiteds provides 4 inches of lift and allows for efficient clearance of up to 35 inch tall tires, when used with body and motor mount lift, larger tires will require aftermarket fenders).This kit is comprised of only the highest end components in the areas of strength, fit, finish, function, and the engineering to back them. This kit is designed specifically for the serious off-roader who not only wants to lift their vehicle and install big tires, but also wants to tackle the toughest trails in the country with confidence and ease.Included in this kit is the full set of 8 Johnny Joint adjustable control arms, double adjustable uppers), set of 4 progressively wound coil springs, front and rear bump stop kits, Johnny Joint adjustable front and rear trac bars, rear trac bar geometry relocation bracket and extended, adjustable front and extended rear sway bar links.For the ultimate off roading package, you'll want to look at all of the upgrade parts that RockJock has to offer that can be added to this kit to finish this build off! Next level offerings such Antirock Sway Bars and Currectlync Heavy Duty Steering are a must for serious off-roading! Shock options to suite this kit are available from all of the top suppliers.

Johnny Joint (R) Suspension Lift Kit | Pro Edition For LJ | 4 in. Lift

MIA's Description

Elevate your off-road adventures with this RockJock 4-Inch Pro Edition Suspension Lift Kit. Designed to enhance both comfort and performance, this kit features RockJock Spec. Dual-Rate Springs offers a soft initial rate that absorbs small bumps for a smooth and comfortable ride. When you encounter larger impacts, the firmer secondary rate comes into play, reducing bottoming and ensuring a more controlled ride. The cleverly positioned crossover point between these rates ensures that the softer initial rate is active at ride height before transitioning to the firmer secondary rate, providing optimal performance on the trails. Crafted for durability and reliability, this Suspension Upgrade Kit includes heavy-duty components such as Johnny Joint Control Arms and Johnny Joint Trac Bars. These high-articulation RockJock Johnny Joints offer over 30 degrees of quiet articulation, minimizing deflection compared to soft rubber-based flex joints. The adjustable length chromoly front and rear bars provide a precise fit and increased strength, while the bump stop spacers keep your tires safely off your vehicle's fenders. With this kit, you're not only getting improved performance but also long-lasting quality to conquer rugged terrain with confidence.

Fitment

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Specifications

BrandRock Jock
Part NumberR01U RJ-LJ0001-101

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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