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Triple Rate Front Coil Springs for Maximum Wrangler JKU Off-Road Lift Performance
The Rock Krawler RKRRK02001P provides 3.5 inches of front lift for the 2007 to 2018 Jeep Wrangler JKU four-door using Rock Krawler's proven triple rate coil spring design. The RKRRK02001P minimizes spring settling over time and keeps the coil seated at full droop, making it the foundation for serious JKU suspension lift builds that demand reliable geometry and controlled articulation. These springs are built with a black powder coat finish and are sold as a pair, ready for direct installation without drilling or modification.
Key Features
- 3.5 inch front lift for 2007-2018 Jeep Wrangler JKU 4-Door
- Triple rate progressive spring design for street comfort and off-road flex
- Minimizes settling for long-term lift height retention
- Coil stays seated at full droop without unseating
- Black powder coat corrosion-resistant finish
- No drilling or modification required
- 5-year warranty
- Sold as a pair
Vehicle Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2007-2018 | Jeep | Wrangler | JKU 4-Door |
Specifications
| Detail | Value |
|---|---|
| Part Number | RKRRK02001P |
| Brand | Rock Krawler |
| Lift Height | 3.5 inches |
| Location | Front |
| 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 RKRRK02001P triple rate front coil springs (pair)
About Rock Krawler
Rock Krawler designs and manufactures premium Jeep suspension systems from their Vermont facility. Their front and rear coil spring systems are engineered as complete matched packages, and the RKRRK02001P front spring is a core component of Rock Krawler's JKU lift system lineup.
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Frequently Asked Questions
What is the RKRRK02001P?The Rock Krawler RKRRK02001P is a pair of triple rate front coil springs that provide 3.5 inches of lift for the 2007 to 2018 Jeep Wrangler JKU four-door. They use a progressive triple rate design for combined on-road ride quality and off-road axle articulation.
What rear spring should I pair with the RKRRK02001P front springs on my JKU?Rock Krawler designs matching front and rear spring pairs for the JKU system. The RKRRK06014P or other Rock Krawler rear coil options are designed to work as a coordinated system with the RKRRK02001P front springs for proper vehicle rake and geometry.
Will the RKRRK02001P work on both two-door and four-door Jeep Wrangler JK models?The RKRRK02001P is designed specifically for the 2007 to 2018 Jeep Wrangler JKU four-door. The two-door JK uses a different front spring specification due to different weight distribution and wheelbase.
Can I run the RKRRK02001P front springs without replacing the front shocks?Running lift springs with stock-length shocks will limit available travel and may cause the shocks to bottom out. Rock Krawler recommends pairing the RKRRK02001P with extended travel shocks sized for the 3.5 inch lift height.
What size tires can I fit with the RKRRK02001P 3.5in front lift on my JKU?A 3.5 inch front lift paired with an appropriate rear spring typically supports 35 inch tires on a stock-width JKU. Fitting 37s may require minor trimming of the front fender flares or a control arm relocation depending on offset and tire width.
Is professional installation recommended for the RKRRK02001P front coil springs?Front coil spring replacement on the JKU requires compressing the spring and working near the control arm assembly. A qualified off-road shop or experienced mechanic with proper spring compressor tools is recommended for safe installation.
How does the triple rate design prevent spring unseating on the JKU?Rock Krawler engineers the free-length of the RKRRK02001P spring to be correct for the JKU coil bucket geometry, ensuring the spring maintains contact with the lower spring perch even at maximum droop. This is a key advantage over some single-rate lift springs that can unseat under extreme articulation.
Do I need a track bar relocation bracket with the RKRRK02001P 3.5in lift?At 3.5 inches of front lift, a track bar relocation bracket is commonly recommended to correct front axle centering and reduce death wobble risk. Rock Krawler offers matching geometry correction components as part of their full JKU suspension systems.
Installation Instructions
- Safely lift and support the front of the Jeep Wrangler JKU on jack stands with the axle hanging freely.
- Remove the front wheels and disconnect the front sway bar end links.
- Support the front axle with a floor jack and remove the front shock absorbers.
- Using a spring compressor where required, carefully remove the factory front coil springs.
- Install the Rock Krawler RKRRK02001P triple rate front coil springs, verifying correct seating in the upper and lower spring perches.
- Reinstall the shocks and reconnect sway bar end links.
- Lower the vehicle and perform a professional four-wheel alignment.
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