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Progressive Triple Rate Front Lift Springs for a Balanced JKU Off-Road Build
The Rock Krawler RKRRK03100P delivers 2.5 inches of front lift for the 2007 to 2018 Jeep Wrangler JKU four-door using Rock Krawler's triple rate coil spring technology. The RKRRK03100P is a popular choice for JKU owners seeking a moderate lift that fits 35 inch tires without requiring extensive geometry correction or body modifications. These springs use the same triple rate architecture as Rock Krawler's full system builds, providing a factory-like ride quality on the street while unlocking significantly more axle articulation for off-road terrain.
Key Features
- 2.5 inch front lift height for 2007-2018 Jeep Wrangler JKU 4-Door
- Triple rate progressive spring design for on-road and off-road balance
- Prevents coil unseating at full droop
- Black powder coat finish for long-term corrosion resistance
- No drilling or modification required for installation
- 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 | RKRRK03100P |
| Brand | Rock Krawler |
| Lift Height | 2.5 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 RKRRK03100P triple rate front coil springs (pair)
About Rock Krawler
Rock Krawler engineers and manufactures suspension lift systems for Jeep Wrangler models from their Vermont-based facility. The RKRRK03100P front coil spring is a core component of Rock Krawler's 2.5 inch JKU lift configurations and is compatible with the full range of Rock Krawler JKU suspension accessories.
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Frequently Asked Questions
What is the RKRRK03100P?The Rock Krawler RKRRK03100P is a pair of triple rate front coil springs providing 2.5 inches of lift for the 2007 to 2018 Jeep Wrangler JKU four-door. They are a direct bolt-on suspension component requiring no modification to the factory frame or axle mounts.
Is 2.5 inches of front lift enough to fit 35 inch tires on a JKU?A 2.5 inch front lift provides sufficient clearance to fit 35 inch tires on a JKU in most configurations, particularly with a minimal body lift or fender flare modification. Exact clearance depends on tire width, offset, and any additional trimming performed.
What rear coil springs should I use with the RKRRK03100P for a level stance?Rock Krawler offers matching rear coil spring options for the JKU that are designed to work with the RKRRK03100P front spring for proper vehicle rake. Contact Black Ops Auto Works to identify the correct Rock Krawler rear spring pairing for your build configuration.
Does the RKRRK03100P require new shocks?Extended travel shocks appropriate for 2.5 inch lift are recommended with the RKRRK03100P to maximize available axle travel and prevent shock bottoming. Running stock shocks limits the benefit of the triple rate spring's articulation range.
Will the RKRRK03100P cause death wobble on my JKU?Lifting a JKU at any height can require track bar adjustment to re-center the front axle. A quality track bar relocation bracket is a common and recommended addition at 2.5 inches to prevent tracking issues and reduce death wobble risk on the JKU platform.
How does the Rock Krawler RKRRK03100P compare to a 2.5in Rubicon Express or Old Man Emu coil?Rock Krawler's triple rate design is a distinguishing feature compared to single-rate coils from most competitors. The progressive rate allows the RKRRK03100P to be softer during normal street driving and stiffen progressively under off-road compression, providing a more versatile spring characteristic than fixed-rate alternatives.
Is the RKRRK03100P the same spring used in Rock Krawler's full JKU lift kits?Yes. The RKRRK03100P uses the same triple rate coil spring technology that Rock Krawler includes in their complete JKU suspension lift systems, ensuring the standalone spring delivers equivalent performance to a full kit build.
Can I install the RKRRK03100P myself with basic tools?Front coil spring replacement requires a coil spring compressor and safe vehicle support equipment. While the spring itself installs without modification, working near compressed springs is a safety-critical procedure best performed by a qualified technician.
Installation Instructions
- Safely lift and support the front of the Jeep Wrangler JKU with the front axle hanging free.
- Remove the front wheels and disconnect the front sway bar end links.
- Compress and remove the factory front coil springs using appropriate spring compressor tools.
- Install the Rock Krawler RKRRK03100P triple rate coil springs, verifying correct seating in both upper and lower spring perches.
- Remove the spring compressor and reinstall sway bar end links and shocks.
- Lower the vehicle and check for correct ride height.
- Perform a professional alignment before returning to road use.
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