JKS J-Kontrol 3.5" Lift Kit w/ J-Spec Shocks | 2020–2024 Jeep Wrangler JL 4-Door EcoDiesel

JKS J-Kontrol 3.5" Lift Kit w/ J-Spec Shocks | 2020–2024 Jeep Wrangler JL 4-Door EcoDiesel

Is This for You?

You want the J-Kontrol geometry correction on your EcoDiesel JL 4-Door at the lowest possible entry cost — or you're planning to run a specific aftermarket shock and want the platform without paying for a duplicate damper. The JSPEC160K delivers the complete J-Kontrol 3.5" system with JKS J-Spec monotube shocks, engineered specifically for the EcoDiesel's heavier front end. It's the base-shock configuration of the J-Kontrol 3.5" EcoDiesel lineup — proven geometry correction, functional damping, and a clear upgrade path when you're ready to step up to Fox.

The Result

3.5" of lift with JKS J-Kontrol geometry correction calibrated for the EcoDiesel's front-end weight. J-Spec monotube shocks provide a functional, predictable damping baseline that outperforms factory units. Adjustable control arms allow precise alignment post-install. The platform is shock-upgrade-ready when you're ready to step up to Fox 2.0 Performance or Fox 2.5 Elite.

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-Kontrol (EcoDiesel-specific coil rate)
• Shock: JKS J-Spec Monotube
• Coil Rate: Heavy-duty — engineered for EcoDiesel front-end mass
• Control Arms: JKS J-Kontrol geometry-corrected control arms
• SKU: JSPEC160K

Installation & Fabrication Notes

Professional 4-wheel alignment required post-installation. Torque all control arm hardware to JKS specification after a 500-mile break-in. No cutting or welding required for standard JL 4-Door EcoDiesel applications. Shock upgrade path (Fox 2.0 Performance, Fox 2.5 Elite) is compatible with this control arm platform — confirm eye-to-eye length with OFAS before purchasing replacement shocks, as EcoDiesel shock travel specs may differ from gas JL variants.

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

Starting with J-Spec shocks on the J-Kontrol 3.5" EcoDiesel JL 4-Door platform and planning a Fox upgrade later — does the EcoDiesel's heavier front-end mass require a different shock eye-to-eye length or spring perch position than the gas JL J-Kontrol 3.5" at the same lift height? Potentially yes — the EcoDiesel-specific coil rate in this kit is tuned for the diesel's front-end weight, which can affect the shock's static ride position and travel arc compared to the gas JL variant. Before purchasing an upgrade shock, contact OFAS with your EcoDiesel's specific build weight and we'll confirm the correct eye-to-eye spec for your platform.