JKS JSPEC160KFA 3.5in J-Kontrol FOX Diesel 392 Lift Kit Jeep Wrangler JL 4-Door

Vehicle Fitment

• 2018-2026 Jeep Wrangler JL Unlimited 4-Door with 3.0L EcoDiesel V6 engine, 4WD
• 2021-2026 Jeep Wrangler JL Unlimited Rubicon 392 with 6.4L V8 engine, 4WD

Fitment Notes

• Diesel and Rubicon 392 engines only - for gas-engine (3.6L/2.0T) JL 4-Door J-Kontrol 3.5" see JSPEC141KFA (STD coils) or JSPEC142KFA (HD coils)
• 4-Door (Unlimited JL) only
• Does not fit 2021-2026 Jeep Wrangler JL 4xe (plug-in hybrid) models
• HD front coil springs (JSPEC1352) included as standard - required to achieve correct lift height and ride quality with the heavier Diesel and 392 front end
• Rubicon models: shock extension brackets can be used with factory FOX 2.5 shocks, but will slightly limit suspension down travel
• Factory wheels cannot be reinstalled without wheel spacers after lift
• Maximum recommended tire size: 35x12.50 on 17x9, 18x9, or 20x9 wheels with 5" backspacing (Sport/Sahara/Willys); 37x12.50 (Rubicon with 5" backspacing)

Features

• JSPEC HD dual-rate front coil springs (JSPEC1352) and standard-rate rear coil springs (JSPEC1359) tuned for the heavier front-end weight of the EcoDiesel V6 and 6.4L V8 engines
• Custom-valved FOX 2.0 Adventure Series IFP monotube gas shocks matched to this Diesel/392 JL J-Kontrol 3.5" system
• Front Control Arm Correction Brackets (heavy-duty, fully boxed 7GA steel - JKS6201) flatten upper and lower control arm angles to correct caster and mimic factory suspension geometry at lifted height
• Retains OE control arms - no replacement arms required
• JKS front adjustable track bar and rear track bar bracket correct axle positioning at lifted ride height
• JKS2033 Quicker Disconnect front sway bar links unlock up to 30% more front axle articulation on the trail
• Rear extended sway bar links correct operating angle and improve strength at lifted height
• Front and rear bump stop extensions properly limit suspension up-travel at lifted height

Specifications

• Lift Height: 3.5 inches
• Platform: Jeep Wrangler JL Unlimited 4-Door - EcoDiesel V6 and Rubicon 392 V8
• System Level: J-Kontrol (step above J-Venture - adds Front Control Arm Correction Brackets)
• Shock Series: FOX 2.0 Adventure Series IFP (custom-valved for this system)
• Control Arm: OE arms retained; geometry corrected via fully boxed 7GA steel correction brackets (JKS6201)
• Front Spring: JSPEC1352 HD Rate (Diesel/392 specific)
• Rear Spring: JSPEC1359 Standard Rate
• Max Recommended Tire Size: 35x12.50 (Sport/Sahara/Willys); 37x12.50 (Rubicon)
• Recommended Wheel Backspacing: 5 inches
• Installation Type: Bolt-on, no cutting or drilling
• Warranty: Limited Lifetime (JKS components); FOX Shocks covered by FOX limited warranty
• Made in USA

Included Components

• 2x JSPEC HD Dual-Rate Front Coil Springs (HD Rate - JSPEC1352, Diesel/392 specific)
• 2x JSPEC Dual-Rate Rear Coil Springs (Standard Rate - JSPEC1359)
• 2x FOX 2.0 Adventure Series IFP Front Shocks (custom-valved)
• 2x FOX 2.0 Adventure Series IFP Rear Shocks (custom-valved)
• 1x Pair Front Control Arm Correction Brackets (7GA steel, fully boxed - JKS6201)
• 1x JKS Front Adjustable Track Bar
• 1x Rear Track Bar Bracket
• 1x Pair JKS2033 Quicker Disconnect Front Sway Bar Links
• 1x Pair Rear Extended Sway Bar Links
• 1x Set Front and Rear Bump Stop Extensions
• 1x Installation hardware pack (JSPEC1310 J-Kontrol Main Box Kit)

Product Description

The JKS JSPEC160KFA is a complete 3.5" J-Kontrol suspension lift system for 2018-2026 Jeep Wrangler JL Unlimited 4-Door models equipped with the 3.0L EcoDiesel V6 or 6.4L Rubicon 392 V8. The J-Kontrol system builds on the J-Venture foundation by adding Front Control Arm Correction Brackets - heavy-duty fully boxed 7GA steel brackets that lower the frame-side mounting point of the front upper and lower control arms, flattening their operating angles at 3.5" of lift to closely mimic factory suspension geometry. The result is improved on-road handling, corrected caster, and optimized driveline angles without replacing the factory control arms.

The critical Diesel/392-specific adjustment in this kit is the front coil spring: JSPEC1352 HD-rate springs replace the standard JSPEC1351 used in gas-engine kits, properly supporting the significantly heavier front-end weight of the diesel and V8 powerplants and delivering the intended 3.5" of lift without settling. Custom-valved FOX 2.0 Adventure Series IFP shocks pair with the HD-front/STD-rear spring combination for a system tuned to the diesel platform's weight distribution. A JKS front adjustable track bar, JKS2033 Quicker Disconnect sway bar links, and rear extended sway bar links complete the geometry correction package. Does not fit 4xe models.