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Lightweight Aluminum Strength for Your JL's Rear Axle
Trail flex and daily drivability do not have to be a trade off. The RK08313 rear lower control arm pair swaps in solid 7075 aluminum construction so your Jeep Wrangler JL or JLU gets increased misalignment capability at the axle without adding unnecessary weight over factory steel arms.
Key Features
- RK08313 built from 7075 solid aluminum bar stock, finished in brushed raw form
- Pro Series Krawler Joint at the axle end offers 60 degrees of misalignment and is fully serviceable and rebuildable
- Service free Adventure Series joint at the frame end adds 35 degrees of misalignment
- Total combined misalignment capability of 95 degrees per arm
- Machined wrench flats at the center of each arm for easy jam nut tightening
- Direct bolt on replacement for factory rear lower control arms
Fitment
| Year Range | Make | Model |
|---|---|---|
| 2018-2026 | Jeep | Wrangler JL/JLU |
Specifications
| Detail | Value |
|---|---|
| MPN | RK08313 |
| Location | Rear Lower |
| Material | 7075 solid aluminum bar, brushed raw finish |
| Misalignment Capability | 95 degrees total per arm |
| Quantity | 2 (pair) |
| Warranty | Abuse Proof Lifetime Warranty |
| Brand | Rock Krawler |
What's Included
- (1) Pair Rock Krawler RK08313 X Factor PRO aluminum rear lower control arms
- Mounting hardware
- Installation instructions
About Rock Krawler
Rock Krawler Suspension has spent decades engineering long arm and mid arm suspension systems, control arms, and shocks purpose built for Jeep Wrangler and Gladiator platforms. Based in New York, the company is known among off road enthusiasts for service free joints, abuse proof warranties, and components tested on real trails before they reach the shelf.
Related Parts on Our Site
- Rock Krawler 2018+ JL/JLU Front Upper Control Arms
- Rock Krawler 2018+ JL/JLU X Series Front Lower Control Arms
- Rock Krawler 2018+ JL/JLU Adventure X Series Front Lower Arm
FAQ
What is the RK08313?The RK08313 is a Rock Krawler X Factor PRO aluminum rear lower control arm pair built from 7075 aluminum for 2018 and newer Jeep Wrangler JL and JLU models, offering 95 degrees of combined misalignment capability.
Does it fit both the two door JL and four door JLU?Yes, this arm pair fits the JL 2 door and JLU 4 door since both share the same rear suspension mounting geometry.
Is this control arm adjustable in length?Yes, the arm features an adjustable joint end so you can fine tune rear pinion angle after a lift installation.
What joint is used at the axle side?A Pro Series Krawler Joint is used at the axle side, offering 60 degrees of misalignment and full serviceability if it ever needs to be rebuilt.
Do these arms require regular maintenance?The frame side Adventure Series joint is service free, while the axle side Krawler Joint is serviceable but does not require scheduled greasing under normal use.
Can I install this arm with hand tools?Yes, installation is a direct bolt on process that can typically be completed with common hand tools and a torque wrench.
What warranty covers the RK08313?Rock Krawler backs this arm pair with its Abuse Proof Lifetime Warranty against defects.
Will this arm work with a lift kit installed?Yes, the adjustable design lets you correct pinion angle changes that come with most common JL and JLU lift heights.
Install Instructions
- Raise and safely support the rear of the Jeep on jack stands, then support the rear axle with a floor jack.
- Remove the factory rear lower control arm bolts at the frame and axle mounting points.
- Remove the factory control arms and set them aside.
- Thread the jam nuts onto the new arms and install them at the frame and axle brackets finger tight.
- Adjust arm length as needed to set proper rear pinion angle.
- Torque all mounting hardware to the vehicle manufacturer's specifications.
- Tighten the jam nuts against the adjuster sleeve using the machined wrench flats.
- Cycle the suspension by hand to confirm clearance and range of motion.
- Lower the Jeep and check rear alignment before returning to normal driving.
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