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Smooth Out Your 4.5 Inch JKU Lift From the Ground Up
The RK06013P is Rock Krawler's triple rate front coil spring built for 2007 to 2018 Jeep Wrangler JKU four door owners running a 4.5 inch lift height. Sold as a pair of springs, the RK06013P combines three spring rates in a single coil to maximize effective travel, resist unseating at full droop, and keep the ride comfortable on the street.
Key Features
- Triple rate spring design blends three spring rates into one coil for a smoother overall ride
- RK06013P delivers approximately 4.5 inches of front lift on the JKU platform
- Coil height of approximately 22.5 inches matches the 4.5 inch lift application
- Resists spring unseating at full suspension droop for better off-road articulation
- Black powder coat finish resists corrosion and trail wear
- Painless, drill-free installation into factory front spring buckets
- Improves ground clearance and off-road capability while maintaining daily drivability
Fitment
| Year Range | Make | Model |
|---|---|---|
| 2007-2018 | Jeep | Wrangler JKU |
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | RK06013P |
| Brand | Rock Krawler |
| Position | Front |
| Lift Height | 4.5 inches |
| Coil Height | Approximately 22.5 inches |
| Spring Type | Triple rate |
| Finish | Black powder coat |
| Warranty | Limited lifetime warranty |
What's Included
- 2 x RK06013P Front Coil Springs
About Rock Krawler
Rock Krawler Suspension has spent decades refining spring rates and suspension geometry for Jeep Wrangler owners, testing components on real trails to make sure they perform on the street and off-road. The RK06013P carries that engineering into a simple, direct spring upgrade for JKU owners chasing a 4.5 inch lift.
Related Parts on Our Site
- Rock Krawler 07-18 Jeep Wrangler JK/JKU JK Adventure Series Front Lower Control Arms
- Rock Krawler 07-18 Jeep Wrangler JK/JKU High Clearance Adjustable Front Lower Control Arms
- Rock Krawler 07-18 Jeep Wrangler JK/JKU 1.5-3.5in Lift Front Adjustable Track Bar
FAQ
What is the RK06013P?The RK06013P is a Rock Krawler triple rate front coil spring for 2007 to 2018 Jeep Wrangler JKU four door models, designed to deliver approximately 4.5 inches of front lift. It is sold as a pair of springs.
Does the RK06013P fit the 2 door JK Wrangler?The RK06013P is specified for the JKU four door platform. Two door JK owners chasing similar lift height should confirm the correct matching part number for 2 door applications with Rock Krawler.
How much lift does the RK06013P provide?The RK06013P is designed to provide approximately 4.5 inches of front lift on a JKU in a standard build configuration.
What does triple rate spring mean?A triple rate spring combines three different spring rates in one coil, improving comfort at normal ride height while still resisting bottoming out and unseating during hard off-road use.
Does the RK06013P come with shocks or control arms?No, the RK06013P is a front coil spring set only. Shocks, control arms, and track bars are sold separately.
Does installing the RK06013P require cutting or drilling?No, the RK06013P is designed for a painless, mod-free installation into the factory front spring buckets.
Will the RK06013P affect my JKU's daily ride quality?The RK06013P's triple rate design is intended to preserve a comfortable street ride while still providing the additional travel and clearance needed for off-road use.
What warranty covers the RK06013P coil springs?The RK06013P is covered by Rock Krawler's limited lifetime warranty against manufacturer's defects.
Can I run 35 inch tires with the RK06013P installed?The RK06013P's 4.5 inch lift height is commonly paired with 35 inch or larger tires on a JKU, though final tire fitment depends on your complete build including wheel backspacing and fender trimming.
Install Instructions
- Raise and safely support the front of the Jeep Wrangler JKU on a lift or jack stands.
- Remove the front wheels and disconnect the sway bar links and any components blocking spring access.
- Support the front axle with a jack and slowly lower it to relieve spring tension.
- Remove the factory front coil springs from the spring buckets.
- Install Rock Krawler correction pads if used to minimize spring bow.
- Set the RK06013P coil spring into the factory spring bucket, ensuring proper seating.
- Raise the axle back into position and reconnect the sway bar links and any removed components.
- Lower the Jeep, cycle the suspension, and check ride height before scheduling an alignment.
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