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Triple Rate Engineering for a Smooth Ride and Confident Trail Travel
The RK03101P rear coil spring set gives the four door Jeep Wrangler JKU a 2.5 inch rear lift built around Rock Krawler's triple rate design. Three distinct spring rates work together to maximize usable suspension travel while resisting spring unseating at full droop. RK03101P is a direct bolt-in replacement for the factory rear coils, tuned to keep ride quality civil on pavement while adding real capability off road.
Key Features
- 2.5 inch rear lift, tuned for four door JKU Rubicon-style builds
- Triple rate spring design for extended travel and reduced unseating at full droop
- Improved ground clearance and off-road ability
- Excellent on-road ride quality compared to single-rate aftermarket springs
- Black powder coat finish for corrosion resistance
- Sold as a pair, engineered specifically for the rear axle
- RK03101P pairs with the RK02659 rear coil correction wedges if not already installed
Fitment
| Year Range | Make | Model |
|---|---|---|
| 2007-2018 | Jeep | Wrangler |
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | RK03101P |
| Location | Rear |
| Lift Height | 2.5 inches |
| Coil Height | 17.5 inches |
| Spring Type | Triple rate |
| Quantity | 2 springs per pair |
| Finish | Black powder coat |
| Warranty | 5-year warranty against fracture |
What's Included
- (2) RK03101P JKU rear coil springs
About Rock Krawler
Rock Krawler has manufactured USA made Jeep suspension components for decades, developing triple rate coil technology proven in King of the Hammers competition. RK03101P brings that same triple rate coil engineering to JKU owners looking for a 2.5 inch rear lift.
Related Parts on Our Site
- Rock Krawler 07-18 Jeep Wrangler JK/JKU High Clearance Adj. Rear Lower Control Arms
- Rock Krawler 07-18 Jeep Wrangler JK/JKU 1.5-3.5in Lift Rear Adjustable Track Bar
- Rock Krawler 07-18 Jeep Wrangler JK/JKU Double Adjustable Rear Upper Control Arms
FAQ
What is the RK03101P?The RK03101P is a Rock Krawler triple rate rear coil spring set for the 2007-2018 Jeep Wrangler JKU that provides a 2.5 inch rear lift. It is sold as a pair and bolts into the factory rear coil location.
What is the difference between RK03101P and RK02002P?RK03101P provides a 2.5 inch rear lift while RK02002P provides a taller 3.5 inch rear lift. Both use the same triple rate coil design but differ in free length and spring rate progression.
Does RK03101P fit the two door JK Wrangler?RK03101P is calibrated for the four door JKU. Two door JK Wranglers typically use a different lift height coil due to the shorter wheelbase and weight distribution.
Do I need correction wedges with RK03101P?If your JKU does not already have rear coil correction wedges installed, Rock Krawler recommends adding part RK02659 alongside RK03101P for proper spring seating.
What does triple rate mean for RK03101P?Triple rate means RK03101P combines three distinct spring rate zones in one coil, giving a soft initial rate for ride comfort, a middle rate for handling, and a firm rate to resist bottoming out.
What is the warranty on RK03101P?RK03101P carries Rock Krawler's 5-year warranty against fracture when properly installed, with a receipt and installation photos kept on file.
Is RK03101P made in the USA?Yes, RK03101P is manufactured in the USA as part of Rock Krawler's domestic coil spring production.
Will RK03101P work with a spare tire delete?Rock Krawler recommends dropping about 1 inch in coil lift height when running a spare tire delete, so RK03101P may ride slightly taller than 2.5 inches in that configuration.
Can RK03101P be installed without a spring compressor?A spring compressor or shop press makes installation of RK03101P significantly safer and easier, though experienced installers can complete the swap with careful axle support alone.
Install Instructions
- Park the Wrangler on level ground, chock the front wheels, and raise the rear end on a jack and jack stands.
- Remove the rear wheels and support the rear axle with a floor jack to control its descent.
- Disconnect the rear sway bar end links and track bar to allow the axle to drop freely.
- Lower the rear axle slowly and remove the factory or existing rear coil springs.
- Install the RK03101P coil springs into the coil buckets, adding correction wedges if needed.
- Raise the axle back into position and reconnect the track bar and sway bar end links.
- Reinstall the wheels and torque all suspension hardware to factory specifications.
- Recheck ride height and re-torque all fasteners after 100 miles of driving.
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
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