JKS J-Konnect 3.5" Lift Kit w/ Fox 2.5 | 2020–2024 Jeep Wrangler JL 4-Door EcoDiesel

JKS J-Konnect 3.5" Lift Kit w/ Fox 2.5 | 2020–2024 Jeep Wrangler JL 4-Door EcoDiesel

Is This for You?

You're running a JL 4-Door EcoDiesel and you want the full J-Konnect long-arm geometry upgrade with Fox 2.5 reservoir damping. The JSPEC159PS delivers JKS long-arm control arms with Fox 2.5 Performance Series reservoir shocks, engineered specifically for the EcoDiesel's heavier front end. The 3.0L V6 diesel adds significant mass over the front axle — this kit's coil rate and long-arm geometry correction are calibrated for that weight. If you want the best geometry correction available for your EcoDiesel JL 4-Door with proven reservoir damping, this is your kit.

The Result

3.5" of lift with JKS long-arm caster and pinion correction calibrated for the EcoDiesel's front-end weight. Fox 2.5 reservoir shocks deliver consistent damping and heat dissipation on extended trail runs under the diesel's heavier front-end load. Adjustable upper and lower control arms allow precise alignment post-install. Axle wrap is eliminated and the EcoDiesel's heavier platform benefits from the long-arm geometry's superior caster correction at this lift height.

Verified Fitment (OFAS Standard)

• Fits: 2020–2024 Jeep Wrangler JL 4-Door (Unlimited) — 3.0L EcoDiesel ONLY
• Does NOT fit: JL Gas Models (2.0T, 3.6L) | JL 4xe Hybrid | JL 2-Door | 2025–2026 JL (EcoDiesel not offered) | JK (any year)
• Engine Note: EcoDiesel was available in the JL 4-Door from 2020–2024 only. Confirm your engine code before ordering.

System Specifications

• Lift Height: 3.5"
• System: J-Konnect Long-Arm (EcoDiesel-specific coil rate)
• Shock: Fox 2.5 Performance Series w/ Reservoir
• Coil Rate: Heavy-duty — engineered for EcoDiesel front-end mass
• Control Arms: JKS adjustable upper and lower long-arm (front and rear)
• SKU: JSPEC159PS

Installation & Fabrication Notes

Long-arm geometry requires a front differential drop or relocation bracket (included or specified in kit). Professional 4-wheel alignment required post-installation. Torque all control arm hardware to JKS specification after a 500-mile break-in. Confirm Fox 2.5 reservoir clearance against diesel-specific underbody components and skid plates. No cutting or welding required for standard JL 4-Door EcoDiesel applications.

Wheel & Tire Fitment

Engineered for 35"–37" tires. Recommended backspacing: 4.5"–4.75" on a 17"×9" or 18"×9" wheel. The EcoDiesel's heavier front end affects fender clearance differently than the gas JL — confirm tire brand and tread width before finalizing wheel selection.

Engineering Question

Running Fox 2.5 reservoir shocks on a J-Konnect 3.5" long-arm EcoDiesel JL 4-Door — does the 3.0L diesel's additional front-end mass require a different Fox 2.5 valving spec than the same shock on a gas JL 4-Door at the same lift height and coil rate? The EcoDiesel's heavier front end increases the static and dynamic load on the front shocks, which means the factory Fox 2.5 valving may feel slightly soft under the diesel's weight on sustained technical terrain. Contact OFAS with your EcoDiesel's total front-end weight and primary terrain and we'll confirm whether the standard Fox 2.5 valving is the right spec or whether the Fox 2.5 Elite DSC gives you the adjustment range you need for your specific build.