JKS J-Kontrol 3.5" Lift Kit w/ Fox Remote Reservoir Shocks | 2007–2018 Jeep Wrangler JK 4-Door

JKS J-Kontrol 3.5" Lift Kit w/ Fox Remote Reservoir Shocks | 2007–2018 Jeep Wrangler JK 4-Door

Is This for You?

You're building a serious trail JK 4-Door Unlimited and you want the thermal capacity of a Fox remote reservoir shock on the J-Kontrol platform. The JSPEC108KFR delivers JKS J-Kontrol geometry-corrected control arms with Fox remote reservoir shocks — the remote canister separates the oil and nitrogen charge from the shock body, dramatically improving heat dissipation on sustained technical terrain. If your JK 4-Door sees long, aggressive trail days with a full accessory load and you want the J-Kontrol's install simplicity with remote reservoir performance, this is your kit.

The Result

3.5" of lift with JKS J-Kontrol geometry correction. Fox remote reservoir shocks maintain consistent damping performance across extended trail runs where body-mounted reservoir shocks begin to fade. Adjustable control arms allow precise alignment post-install. The JK 4-Door's heavier platform and longer wheelbase benefit significantly from the remote reservoir's sustained damping consistency under load on extended trail days.

Verified Fitment (OFAS Standard)

• Fits: 2007–2018 Jeep Wrangler JK 4-Door Unlimited (Sport, Sahara, Rubicon)
• Does NOT fit: JK 2-Door | JL Wrangler (2018–2026) | Gladiator JT | Any JL variant
• Platform Note: JK production ended 2018. This kit does NOT apply to any 2019+ Wrangler.

System Specifications

• Lift Height: 3.5"
• System: J-Kontrol
• Shock: Fox Remote Reservoir (remote canister, extended oil volume, nitrogen charged)
• Coil Rate: Tuned for JK 4-Door platform
• Control Arms: JKS J-Kontrol geometry-corrected control arms
• SKU: JSPEC108KFR

Installation & Fabrication Notes

Professional 4-wheel alignment required post-installation. Torque all control arm hardware to JKS specification after a 500-mile break-in. Remote reservoir canister routing must be planned during install — confirm clearance against frame, skid plates, and body panels before finalizing mount locations. The J-Kontrol system does not require a differential drop, which simplifies canister routing compared to a long-arm conversion. No cutting or welding required for standard JK 4-Door applications.

Wheel & Tire Fitment

Engineered for 35"–37" tires. Recommended backspacing: 4.5"–4.75" on a 17"×9" or 18"×9" wheel. Confirm fender clearance with specific tire brand and tread width before finalizing wheel selection.

Engineering Question

Routing Fox remote reservoir canisters on a J-Kontrol 3.5" JK 4-Door Unlimited — does the J-Kontrol's control arm geometry create any unique canister clearance challenges compared to the J-Konnect long-arm on the same platform? The J-Kontrol doesn't require a differential drop, which removes one potential canister conflict point — but the 4-Door's longer frame and additional body panels create their own routing considerations, particularly at the rear. Optimal canister placement depends on your specific skid plate setup, rock rail configuration, and whether you're running a rear locker. Contact OFAS before your install and we'll walk you through the canister routing that works for your specific JK 4-Door J-Kontrol build.