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Front End Lift Built to Match Your Rear, Not Fight It
Mismatched front and rear ride height is one of the fastest ways to ruin the stance and handling of a lifted Wrangler. The RockJock RJ-144100-101 front coil spring pair is engineered to deliver a matched 3.5 inch lift at the front axle of a Jeep Wrangler JL Unlimited, keeping your suspension geometry balanced front to rear. Finished in gloss black powder coat and designed to work with factory coil spring isolators, this spring pair is built as a companion to RockJock's rear springs and complete Pro Edition suspension systems, giving you a level, confident stance on road and off.
Key Features
- Purpose built front coil springs delivering a 3.5 inch lift on Jeep Wrangler JL Unlimited
- Free length of 20.000 inches engineered for consistent front ride height
- Gloss black powder coat finish resists chipping and corrosion
- Engineered to work with factory coil spring isolators, top and bottom
- Designed to pair with RockJock rear coil springs for balanced, level ride height
- Sold as a pair for a complete front axle installation
- Part of the RockJock RJ-JLG001-101 Pro Edition JL Suspension System lineup
Fitment Table
| Year Range | Make | Model |
|---|---|---|
| 2018-2026 | Jeep | Wrangler JL Unlimited (3.6L V6 and 2.0T I4) |
Specifications
| Detail | Value |
|---|---|
| Brand | RockJock |
| Part Number | RJ-144100-101 |
| Location | Front |
| Lift Height | 3.5 inch |
| Free Length | 20.000 in. |
| Finish | Gloss Black Powder Coat |
| Quantity | Pair (2 Springs) |
| UPC | Not published by manufacturer |
What's Included
- (2) RockJock 3.5 in. Lift Front Coil Springs
About RockJock
RockJock 4x4 designs and manufactures heavy duty suspension, axle, and steering components engineered for serious off road use without giving up on road manners. Every RockJock coil spring is developed and tested as part of a complete suspension system, so lift height, spring rate, and ride quality are dialed in together rather than guessed at individually.
FAQ
What is the RJ-144100-101?
The RJ-144100-101 is a pair of RockJock front coil springs built for the Jeep Wrangler JL Unlimited, delivering a 3.5 inch lift with a free length of 20.000 inches and a gloss black powder coat finish.
How much lift does this spring provide?
This spring pair is designed to deliver a 3.5 inch lift at the front axle when installed as a set.
Will this fit my Jeep Wrangler JL Unlimited?
Yes, provided your Wrangler JL Unlimited is equipped with the 3.6L V6 or 2.0T I4 drivetrain. EcoDiesel, 392, and 4xe hybrid models use a different spring part number due to their unique weight distribution.
Should I install this with the matching RockJock rear spring?
Yes, this front spring is engineered to pair with the RJ-144400-101 rear spring so the front and rear ride height stay balanced at 3.5 inches of lift.
Do I need new bump stops with this spring?
RockJock recommends installing properly matched bump stops when adding lift, since factory bump stops are calibrated for stock ride height and may contact the frame prematurely at 3.5 inches of lift.
Can I reuse my factory coil spring isolators?
Yes, this spring is engineered to work with the factory upper and lower coil spring isolators, so no isolator replacement is required for installation.
Is this spring sold individually or as a pair?
This listing includes two front coil springs, enough for a complete front axle installation.
What finish does this spring use?
Each spring receives a gloss black powder coat finish for long term resistance to rust and chipping in off road conditions.
Install Instructions
- Safely raise and support the front of the vehicle, then remove the front wheels.
- Support the front axle with a jack and disconnect the sway bar links, track bar, and any other components anchored to the axle as needed for clearance.
- Slowly lower the axle to relieve spring tension, then remove the factory coil springs and isolators if they are being reused, keeping isolators in their original orientation.
- Position the new RockJock front coil springs onto the factory isolators, top and bottom, ensuring proper seating.
- Raise the axle back into position, reconnecting the sway bar links, track bar, and any other previously removed components.
- Install properly matched bump stops if not already upgraded for the new ride height.
- Reinstall the wheels, lower the vehicle, and torque all fasteners to manufacturer specification.
- Perform a front end alignment and inspect all suspension hardware after the first several hundred miles of driving.
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