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🧾 Overview
The TeraFlex JL 4-Door 3.5 Inch Sport ST3 Suspension System for the Jeep Wrangler Unlimited JL 392 is engineered specifically to handle the added weight, torque, and performance demands of the factory 6.4L V8 platform. Built on the proven Sport ST (Street & Trail) architecture, this system prioritizes ride quality, steering control, and off-road capability in a dependable, maintenance-free package.
Front Control Arm Sport Frame Brackets restore proper caster on taller lifts to improve highway manners and reduce brake nose dive, while heavy-duty front and rear track bar axle brackets correct axle positioning and optimize roll center. Carefully matched lift springs, bump stops, and sway bar components deliver a refined on-road ride with confident articulation on the trail.
Note: Shocks are not included. Falcon Performance Shocks are recommended for optimal compression, rebound, and vehicle stability.
✔ JL 392–specific Sport ST3 suspension system
✔ Tuned for increased V8 engine weight and power
✔ Geometry-correcting frame and axle brackets
✔ Improved steering response and reduced brake nose dive
✔ Trail-ready flex with daily-driver comfort
🛠 Installation
- Direct bolt-on installation using factory mounting points. No cutting or welding required. Designed for a simple install-and-drive upgrade. Professional installation and alignment are recommended for optimal performance and handling.
📌 Specs
- Key Features & Benefits
- Sport ST lift coil springs tuned for ride quality and durability
- Front Control Arm Sport Frame Brackets restore caster and pinion angles
- Front and rear track bar axle brackets recenter axles and optimize roll center
- Progressive bump stops reduce harsh bottom-out and protect components
- Front sway bar quick disconnects improve off-road articulation
- Maintenance-free design reduces noise, vibration, and harshness (NVH)
- Bolt-on system delivers install-and-drive convenience
📘 Specifications
- Brand: TeraFlex
- System Type: Sport ST3 Suspension System
- Lift Height: 3.5 inches
- Position: Front & Rear
- Vehicle Platform: Jeep Wrangler Unlimited JL 392
- Body Style: 4-Door
- Shock Compatibility: Not included (Falcon Performance Shocks recommended)
- Installation Type: Bolt-on
- Maximum Tire Size (with proper bump stop configuration):
- Sport / Sahara Fenders
- 35" – 3" front / 2.5" rear
- Rubicon Fenders
- 35" – 2" front / 2" rear
- 37" – 2.5" front / 3" rear
📦 What’s Included (What’s in the Box)
- Front Components
- 3.5" front lift coil springs
- Front Control Arm Sport Frame Brackets
- Front track bar axle bracket
- Progressive front bump stops
- Front sway bar quick disconnects
- Rear Components
- 3.5" rear lift coil springs
- Rear track bar axle bracket
- Progressive rear bump stops
- Additional
- All required mounting hardware
🛡 Warranty
- Manufacturer-backed warranty provided by TeraFlex.
⚠️ Fitment Notes
- Jeep Wrangler Unlimited JL 392 (4-Door)
⚠️ Fitment Notes
- Fits JL 392 models only. Does not fit non-392 JL or 2-door JL models. Shocks are not included. Tire fitment depends on fender type, wheel offset, and bump stop configuration. Professional installation is recommended; alignment requirements may vary by setup.