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Serious Off-Road Geometry Without the Maintenance Headaches
The RK06779B is Rock Krawler's fixed-length Adventure Series front lower control arm, engineered for Jeep Wrangler JL and JLU owners who want a durable, maintenance-free upgrade to their factory suspension. Built from 1.75 inch solid alloy steel bar stock, the RK06779B corrects the bind found in factory lower arms while adding real ground clearance for trail driving.
Key Features
- Constructed from 1.75 inch solid alloy steel bar for maximum strength
- RK06779B arm bends upward for improved off-road ground clearance
- Service free Adventure Series joints at both ends deliver up to 70 degrees of combined misalignment
- Fixed, non-directional length simplifies installation and eliminates jam nut maintenance
- Durable black powder coat finish resists corrosion and trail wear
- Correct geometry ideal for lift heights up to 3.5 inches
- Sold as the front lower arm only, designed to pair with matching Adventure Series uppers
Fitment
| Year Range | Make | Model |
|---|---|---|
| 2018-2026 | Jeep | Wrangler JL |
| 2018-2026 | Jeep | Wrangler JLU |
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | RK06779B |
| Brand | Rock Krawler |
| Position | Front Lower |
| Material | 1.75 inch solid alloy steel |
| Finish | Black powder coat |
| Misalignment Capability | Up to 70 degrees combined |
| Length Type | Fixed, non-directional |
| Recommended Lift Height | Up to 3.5 inches |
| Warranty | Abuse Proof Lifetime Warranty on hard parts |
What's Included
- 2 x RK06779B Adventure Series Front Lower Control Arms
- Required mounting hardware for OEM-location installation
About Rock Krawler
Rock Krawler Suspension has spent decades building off-road suspension systems for Jeep and off-road enthusiasts, with a reputation built on abuse proof hard parts and service free joint technology. Every RK06779B arm reflects that same commitment to trail durability and daily drivability.
Related Parts on Our Site
- Rock Krawler 2018+ Jeep Wrangler JL 2DR / JLU 4DR Front Upper Adventure Series Control Arms
- Rock Krawler 2018+ Jeep Wrangler JL 2DR / JLU 4DR Front Adjustable Track Bar
- Rock Krawler 2018+ Jeep Wrangler JL 2DR / JLU 4DR Adv. X Series Front Lower Arm
FAQ
What is the RK06779B?The RK06779B is a Rock Krawler Adventure Series fixed length front lower control arm for 2018 and newer Jeep Wrangler JL and JLU models. It is built from 1.75 inch solid alloy steel with service free joints and is designed for lift heights up to 3.5 inches.
Does the RK06779B fit both JL and JLU Wrangler models?Yes, the RK06779B fits both the 2 door JL and 4 door JLU Wrangler platforms from 2018 and newer.
Is the RK06779B adjustable in length?No, the RK06779B is a fixed length arm. Rock Krawler also offers the adjustable Adventure X front lower arm if length adjustability is needed.
What lift height is the RK06779B designed for?The RK06779B is designed for lift heights up to approximately 3.5 inches when used as part of a complete Adventure Series suspension setup.
Do I need to replace both front lower arms or just one?The RK06779B is sold as a set of two arms so both sides of the front lower suspension are replaced together for consistent geometry.
Does the RK06779B require any drilling or cutting to install?No, the RK06779B is a bolt-on replacement that uses the factory mounting locations, so no drilling or cutting is required.
What is the misalignment rating of the RK06779B joints?The Adventure Series joints on the RK06779B provide up to 70 degrees of combined misalignment capability, which reduces suspension bind during articulation.
Is the RK06779B maintenance free?Yes, the Adventure Series joints used on the RK06779B are service free and do not require periodic greasing under normal use.
What warranty covers the RK06779B?The RK06779B is covered by Rock Krawler's Abuse Proof Lifetime Warranty on hard parts, which replaces arms that are bent, broken, or damaged in a way that affects function when properly installed.
Install Instructions
- Raise and safely support the front of the Jeep Wrangler on a lift or jack stands.
- Remove the front wheels and support the front axle to relieve suspension load.
- Remove the factory front lower control arm bolts at the frame and axle mounting points, saving the OEM hardware for reuse.
- Remove the factory front lower control arms and discard.
- Position the RK06779B arm with the bend oriented upward for correct ground clearance.
- Install the RK06779B arm using the OEM hardware at both the frame and axle mounting points, torquing to factory specification.
- Repeat the process for the opposite side.
- Lower the Jeep, cycle the suspension, and check for clearance issues before performing a front end alignment.
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