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

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

Is This for You?

You want the J-Konnect long-arm geometry 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 JSPEC159K delivers the complete J-Konnect 3.5" long-arm 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-Konnect 3.5" EcoDiesel lineup — proven long-arm 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 long-arm caster and pinion correction calibrated for the EcoDiesel's front-end weight. J-Spec monotube shocks provide a functional, predictable damping baseline that outperforms factory units under the diesel's heavier front-end load. Adjustable upper and lower 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-Konnect Long-Arm (EcoDiesel-specific coil rate)
• Shock: JKS J-Spec Monotube
• Coil Rate: Heavy-duty — engineered for EcoDiesel front-end mass
• Control Arms: JKS adjustable upper and lower long-arm (front and rear)
• SKU: JSPEC159K

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. 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-Konnect 3.5" long-arm EcoDiesel JL 4-Door platform — how does the 3.0L diesel's additional front-end mass affect the J-Spec monotube's performance ceiling compared to the same shock on a gas JL 4-Door at the same lift height? The EcoDiesel's heavier front end increases the static and dynamic load on the front shocks, which means the J-Spec monotube reaches its performance ceiling faster on the diesel than on a gas JL under the same terrain conditions. For daily driving and moderate trail use, the J-Spec is a functional starting point. If you're running sustained technical terrain or adding accessories, contact OFAS and we'll spec the right Fox upgrade path for your specific EcoDiesel build before you hit that ceiling.