JKS JSPEC123KFA 3.5in J-Konnect Lift Kit FOX 2018-2026 Jeep Wrangler JL 4-Door

Vehicle Fitment

• 2018-2026 Jeep Wrangler JL Unlimited 4-Door (Sport, Sport S, Sahara, Rubicon, Willys, High Altitude, Freedom), 4WD

Fitment Notes

• Does not fit 2021-2026 Jeep Wrangler JL 4xe models - see JKS 4xe-specific lift kit
• Does not fit Wrangler JL Rubicon 392 models - see JSPEC159KFA for Diesel/392 applications
• 4-Door (Unlimited JL) only - for 2-Door Wrangler JL J-Konnect 3.5" see JSPEC124KFA
• 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, roof rack, or heavy accessories
• Maximum recommended tire size: 35x12.50 on 17x9, 18x9, or 20x9 wheels with 5" backspacing (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 3.5" lift
• Custom-valved FOX 2.0 Adventure Series IFP monotube gas shocks matched to this JL J-Konnect 3.5" system
• Front and rear J-Link lower control arms (heavy-duty 2" x .250-wall DOM tubing) deliver serious strength over factory arms while correcting front caster and rear wheelbase
• OE-style rubber bushings at both J-Link arm ends minimize NVH for a quiet, street-friendly ride
• 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 (2018-2026)
• System Level: J-Konnect (step above J-Venture - adds J-Link lower control arms)
• Shock Series: FOX 2.0 Adventure Series IFP (custom-valved; front FOX98450323, rear FOX98450327)
• Control Arm Construction: 2" x .250-wall DOM tubing, fixed length J-Link lower arms (JKS1671)
• 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 - JSPEC1311)
• 2x JSPEC Dual-Rate Rear Coil Springs (Standard or HD Rate - JSPEC1351/JSPEC1359)
• 2x FOX 2.0 Adventure Series IFP Front Shocks - FOX98450323 (custom-valved)
• 2x FOX 2.0 Adventure Series IFP Rear Shocks - FOX98450327 (custom-valved)
• 2x Front J-Link Lower Control Arms (fixed length, 2" x .250-wall DOM - JKS1671)
• 2x Rear J-Link Lower Control Arms (fixed length, 2" x .250-wall DOM - JKS1671)
• 1x JKS Front Adjustable Track Bar (JKS1621)
• 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 JSPEC123KFA is a complete 3.5" J-Konnect suspension lift system for the 2018-2026 Jeep Wrangler JL Unlimited 4-Door. J-Konnect builds directly on the proven J-Venture platform by adding front and rear J-Link lower control arms - the defining upgrade that separates J-Konnect from the entry-level J-Venture system. J-Link arms are fabricated from 2" x .250-wall DOM tubing with large factory-style rubber bushings at both ends, providing a dramatic strength advantage over factory stamped arms while simultaneously correcting front caster and rear axle wheelbase geometry at 3.5" of lift. The result is trail-capable strength with on-road handling that remains comfortable and predictable.

Custom-valved FOX 2.0 Adventure Series IFP monotube shocks are tuned alongside JSPEC dual-rate coil springs - available in standard or HD rate for heavier builds - for a well-matched, cohesive system. The JKS front adjustable track bar keeps the front axle properly centered, while JKS2033 Quicker Disconnect sway bar links provide up to 30% more front axle articulation at the trailhead. Rear extended sway bar links restore proper geometry at the rear. At 3.5" of lift, Sport and Sahara models run up to 35x12.50 tires, while Rubicon models can clear 37x12.50. Does not fit 4xe or Rubicon 392 models.