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Maximize Articulation Without Sacrificing Ride Quality
The Skyjacker JKU40FDR front coil spring set gives your 2007-2018 Jeep Wrangler JK Unlimited a 4 inch lift with a dual rate long travel design that keeps the coil seated in the bucket at full droop. Higher strength alloy over competing springs resists sagging and fatigue so the JKU40FDR holds its lift height for the long haul.
Key Features
- Dual rate long travel coil design
- Maintains coil seating in bucket at full droop
- Maximizes suspension articulation
- Higher strength alloy resists sagging and fractures
- Powder coated finish for corrosion resistance
- Sold as a front pair
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2007-2017 | Jeep | Wrangler | Unlimited Rubicon |
| 2007-2017 | Jeep | Wrangler | Unlimited Sahara |
| 2010-2017 | Jeep | Wrangler | Unlimited Sport |
| 2018 | Jeep | Wrangler JK | Unlimited Rubicon |
| 2018 | Jeep | Wrangler JK | Unlimited Sahara |
| 2018 | Jeep | Wrangler JK | Unlimited Sport |
Specifications
| Detail | Value |
|---|---|
| MPN | JKU40FDR |
| UPC | N/A |
| Lift Height | 4.0 Inch |
| Position | Front |
| Drivetrain | 2WD/4WD |
| Country of Origin | USA |
| Sold As | Pair |
| Warranty | Limited Lifetime |
What's Included
- Two front dual rate long travel coil springs
About Skyjacker
Skyjacker Suspensions has engineered off-road and towing suspension products since 1970, building a reputation for durable lift kits and coil springs that hold up to real world use on and off the pavement.
Related Parts
What is the JKU40FDR?
The JKU40FDR is a Skyjacker 4 inch front dual rate long travel coil spring pair for 2007-2018 Jeep Wrangler JK Unlimited models. It maximizes articulation while resisting sag over time.
Are the JKU40FDR springs side specific?
No, the front springs in the JKU40FDR set are not side specific and can be installed on either side.
Does the JKU40FDR fit 2 door Wranglers?
No, the JKU40FDR is engineered specifically for the 4 door Wrangler Unlimited platform.
Do I need new shocks with the JKU40FDR?
Yes, longer travel shocks matched to a 4 inch lift are recommended alongside the JKU40FDR for best performance.
Will the JKU40FDR work with 2WD Wranglers?
Yes, the JKU40FDR is compatible with both 2WD and 4WD Wrangler JK Unlimited models.
What warranty comes with the JKU40FDR?
Skyjacker backs the JKU40FDR with a limited lifetime warranty against manufacturing defects.
Does installing the JKU40FDR require an alignment?
Yes, a front end alignment is recommended after installing the JKU40FDR to restore proper handling.
What tire size does the JKU40FDR allow?
Most owners run 35 inch tires after installing the JKU40FDR with proper wheel backspacing.
Install Instructions
- Raise and support the front of the vehicle, then remove the wheels.
- Support the lower control arm and disconnect the sway bar end link and track bar as needed.
- Compress and remove the factory front coil springs.
- Install the JKU40FDR springs, reconnecting the track bar and sway bar links.
- Reinstall wheels, torque hardware to spec, and perform a front end alignment.
Prop 65 Warning
This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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