{"product_id":"jks-jspec138k","title":"JKS J-Kontrol 2.5\" Lift Kit w\/ J-Spec Shocks | HD Coils | 2018–2026 Jeep Wrangler JL 4-Door","description":"\u003ch2\u003eJKS J-Kontrol 2.5\" Lift Kit w\/ J-Spec Shocks | HD Coils | 2018–2026 Jeep Wrangler JL 4-Door\u003c\/h2\u003e\n\n\u003ch3\u003eIs This for You?\u003c\/h3\u003e\n\u003cp\u003eYou want the J-Kontrol geometry correction on your accessorized 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 JSPEC138K delivers the complete J-Kontrol 2.5\" HD system with JKS J-Spec monotube shocks. It's the base-shock, heavy-duty coil configuration of the J-Kontrol 2.5\" lineup for accessorized builds that want a clean geometry upgrade without a long-arm conversion.\u003c\/p\u003e\n\n\u003ch3\u003eThe Result\u003c\/h3\u003e\n\u003cp\u003e2.5\" of lift with JKS J-Kontrol geometry correction. HD coils maintain ride height under accessory loads. 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 2.5 or Fox 2.5 Elite.\u003c\/p\u003e\n\n\u003ch3\u003eVerified Fitment (OFAS Standard)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e 2018–2026 Jeep Wrangler JL 4-Door (Unlimited) — Gas Models (2.0T, 3.6L)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoes NOT fit:\u003c\/strong\u003e JL 2-Door | JL EcoDiesel | JL 4xe Hybrid | JK (any year) | Gladiator JT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoil Note:\u003c\/strong\u003e HD Rate — engineered for accessorized JL 4-Door builds with steel bumpers or winch. Use JSPEC137K (Std-Rate) for stock-weight builds.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSystem Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLift Height: 2.5\"\u003c\/li\u003e\n\u003cli\u003eSystem: J-Kontrol\u003c\/li\u003e\n\u003cli\u003eShock: JKS J-Spec Monotube\u003c\/li\u003e\n\u003cli\u003eCoil Rate: HD — tuned for accessorized JL 4-Door builds\u003c\/li\u003e\n\u003cli\u003eControl Arms: JKS J-Kontrol geometry-corrected control arms\u003c\/li\u003e\n\u003cli\u003eSKU: JSPEC138K\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation \u0026amp; Fabrication Notes\u003c\/h3\u003e\n\u003cp\u003eProfessional 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 gas applications. Shock upgrade path (Fox 2.5, Fox 2.5 Elite DSC) is compatible with this control arm platform — confirm eye-to-eye length with OFAS before purchasing replacement shocks.\u003c\/p\u003e\n\n\u003ch3\u003eWheel \u0026amp; Tire Fitment\u003c\/h3\u003e\n\u003cp\u003eEngineered for 35\" tires on an accessorized build. Recommended backspacing: 4.5\"–4.75\" on a 17\"×9\" or 18\"×9\" wheel. At 2.5\" of lift, fender clearance with 35s is tight — confirm tire brand and tread width before finalizing wheel selection.\u003c\/p\u003e\n\n\u003ch3\u003eEngineering Question\u003c\/h3\u003e\n\u003cblockquote\u003e\u003cp\u003eStarting with J-Spec shocks on the J-Kontrol 2.5\" HD JL 4-Door platform with a steel bumper and winch — how does the HD coil's stiffer spring rate affect the J-Spec monotube's performance ceiling under the accessory load compared to the same shock on a standard-rate coil build? The HD coil's stiffer spring rate reduces the shock's dynamic load per compression cycle compared to a softer standard-rate coil under the same accessory weight — which actually gives the J-Spec more thermal headroom on the HD build than it would have on a standard-rate build with the same accessories. For daily driving and moderate trail use on an accessorized JL 4-Door, the J-Spec is a functional starting point. Contact OFAS when you're ready to spec the Fox upgrade and we'll confirm the right eye-to-eye length for your specific build.\u003c\/p\u003e\u003c\/blockquote\u003e","brand":"JKS Manufacturing","offers":[{"title":"Default Title","offer_id":51444634026305,"sku":"JSPEC138K","price":1345.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0974\/1284\/1793\/files\/JSPEC138K_0-BKWD.jpg?v=1772726137","url":"https:\/\/obsidianforgedautosupply.com\/products\/jks-jspec138k","provider":"Obsidian Forged Auto Supply","version":"1.0","type":"link"}