JKS JSPEC137KFA 2.5in J-Kontrol Lift Kit FOX 2018-2025 Jeep Wrangler JL 4-Door

Vehicle Fitment

• 2018-2025 Jeep Wrangler JL Unlimited 4-Door (Sport, Sport S, Sahara, Rubicon, Willys, High Altitude, Freedom), 4WD

Fitment Notes

• Does not fit 2021-2025 Jeep Wrangler JL 4xe models
• Does not fit Wrangler JL Rubicon 392 models - see JSPEC166KFA for Diesel/392 applications
• 4-Door (Unlimited JL) only - for 2-Door Wrangler JL J-Kontrol 2.5" see JSPEC138KFA
• Factory wheels cannot be reinstalled without wheel spacers after lift
• HD front springs recommended for builds with aftermarket winch and bumper combination
• HD rear springs recommended for builds with rear-mounted full-size spare tire or heavy accessories
• Maximum recommended tire size: 35x12.50 (Sport/Sahara/Willys); 37x12.50 (Rubicon with 5" backspacing)
• HD Rate Coil Spring upgrade available at time of order for added payload capacity

Features

• JSPEC dual-rate front and rear coil springs (standard or HD rate) tuned specifically for the 4-Door JL platform at 2.5" lift
• Custom-valved FOX 2.0 Adventure Series IFP monotube gas shocks matched to this JL J-Kontrol 2.5" 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
• 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: 2-3.5 inches (nominal 2.5")
• Platform: Jeep Wrangler JL Unlimited 4-Door (2018-2025)
• 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 7GA steel correction brackets (JKS6201)
• Spring Type: JSPEC dual-rate coil springs - Standard or HD Rate option
• 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 Dual-Rate Front Coil Springs (Standard or HD Rate)
• 2x JSPEC Dual-Rate Rear Coil Springs (Standard or HD Rate)
• 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

Product Description

The JKS JSPEC137KFA is a complete 2.5" J-Kontrol suspension lift system for the 2018-2025 Jeep Wrangler JL Unlimited 4-Door. J-Kontrol builds directly on the proven J-Venture foundation by adding one defining upgrade: Front Control Arm Correction Brackets fabricated from heavy-duty fully boxed 7GA steel. These brackets lower the frame-side mounting point of the front upper and lower control arms, flattening their operating angles to closely mimic factory suspension geometry at 2.5" of lift. The result is improved on-road handling, corrected caster, and optimized driveline angles - all while retaining the factory control arms, making J-Kontrol a true bolt-on geometry upgrade that outperforms the J-Venture system without requiring arm replacement.

Custom-valved FOX 2.0 Adventure Series IFP shocks are matched alongside JSPEC dual-rate coil springs - available in standard or HD rate for heavier builds - for a cohesive, precisely tuned system. The JKS front adjustable track bar and rear track bar bracket keep the front axle properly centered, JKS2033 Quicker Disconnect sway bar links provide up to 30% more front articulation at the trailhead, and rear extended sway bar links restore proper geometry at the rear. At 2.5" of lift, Sport and Sahara models fit up to 35x12.50 tires, and Rubicon models accommodate 37x12.50. Does not fit 4xe or Rubicon 392 models.