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Maximum Articulation Rear Coil Springs for the Four-Door Jeep Wrangler JKU
The Rock Krawler RKRRK06014P provides 4.5 inches of rear lift for the 2007 to 2018 Jeep Wrangler JKU four-door through a proven triple rate coil spring design. The RKRRK06014P is engineered to deliver a comfortable on-road driving experience while supporting maximum rear axle travel for technical off-road terrain. Rock Krawler's triple rate architecture prevents spring unseating at full droop and minimizes settling over time, ensuring the stated lift height is maintained throughout the spring's service life.
Key Features
- 4.5 inch rear lift height for 2007-2018 Jeep Wrangler JKU 4-Door
- Triple rate design for on-road comfort and off-road articulation
- Black powder coat finish for corrosion resistance
- No drilling or modification required
- 5-year warranty coverage
- Sold as a pair
Vehicle Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2007-2018 | Jeep | Wrangler | JKU 4-Door |
Specifications
| Detail | Value |
|---|---|
| Part Number | RKRRK06014P |
| Brand | Rock Krawler |
| Lift Height | 4.5 inches |
| Location | Rear |
| Spring Type | Triple Rate |
| Finish | Black Powder Coat |
| Quantity | Pair (2 springs) |
| Warranty | 5 Year |
| Fitment | 2007-2018 Jeep Wrangler JKU 4-Door |
| Condition | New |
| UPC | N/A |
What's Included
- Rock Krawler RKRRK06014P triple rate rear coil springs (pair)
About Rock Krawler
Rock Krawler is a suspension engineering company based in Vermont with a singular focus on Jeep suspension systems. Their triple rate coil spring technology is the foundation of their complete JK and JL suspension lift systems, used by thousands of JKU owners across every terrain type.
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Frequently Asked Questions
What is the RKRRK06014P?The Rock Krawler RKRRK06014P is a pair of triple rate rear coil springs providing 4.5 inches of lift for the 2007 to 2018 Jeep Wrangler JKU four-door platform. They are designed for both street and off-road use with a progressive spring rate that maximizes axle articulation.
Does the RKRRK06014P fit both Rubicon and Sport JKU models?Yes. The RKRRK06014P fits all 2007 to 2018 Jeep Wrangler JKU four-door models including Sport, Sahara, and Rubicon trim levels, which share the same rear coil spring dimensions.
What is the difference between the RKRRK06014P 4.5in and the RKRRK02001P 3.5in rear coil option?The RKRRK06014P provides 4.5 inches of rear lift, making it suitable for more aggressive builds with larger tires and higher clearance requirements. The 3.5 inch option is typically paired with front springs for moderate lift builds, while 4.5 inch rear springs are common in full suspension lift system configurations.
Will the RKRRK06014P coil springs work with factory JKU shocks?Factory shocks are not long enough to take full advantage of the travel available with a 4.5 inch lift coil spring. Rock Krawler recommends replacing shocks with extended travel units appropriate for the lift height to prevent coil unseating and ensure proper handling.
Do I need correction arms with the RKRRK06014P?At 4.5 inches of rear lift, control arm correction is typically recommended to restore proper pinion angle and prevent driveline vibration on the JKU. Consult Rock Krawler for their recommended control arm pairings at this lift height.
Is the RKRRK06014P suitable for the two-door JK Wrangler?The RKRRK06014P is specifically designed for the four-door JKU Wrangler. Rock Krawler offers separate rear coil spring applications for the two-door JK with different geometry requirements.
What tire size is compatible with the RKRRK06014P on a stock JKU?A 4.5 inch rear lift combined with an appropriate front lift typically supports 37 inch tires on a stock-width JKU axle, though fender and body trimming may still be required for full lock-to-lock clearance. Always verify clearance with your specific build configuration.
How do the Rock Krawler RKRRK06014P springs compare to factory JKU rear springs?The RKRRK06014P provides significantly more lift and articulation than the factory JKU rear springs. The triple rate design offers better off-road flex while maintaining a smoother street ride than single-rate lift springs of equivalent height.
Installation Instructions
- Safely lift and support the rear of the Jeep Wrangler JKU on jack stands with the axle hanging freely.
- Support the rear axle with a floor jack.
- Disconnect the rear sway bar end links and lower the axle to release the factory coil springs.
- Remove the OEM rear coil springs and any factory isolators.
- Install the Rock Krawler RKRRK06014P triple rate springs, ensuring they seat correctly in the upper and lower perches.
- Raise the axle, reconnect the sway bar end links, and reinstall the rear shocks if previously removed.
- Lower the vehicle and check ride height before performing a professional alignment.
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