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🧾 Overview
The Rock Krawler 3.5" Adventure Series Mid-Arm Suspension System for the Jeep Wrangler JLU (2018–Present) is engineered for Jeep owners who want maximum capability while retaining excellent road manners and a true bolt-on installation. This system delivers increased clearance, improved suspension geometry, and the durability required to confidently run up to 40-inch tires, depending on configuration.
At the heart of the system are Rock Krawler’s industry-leading service-free control arm joints, designed to deliver smooth articulation without maintenance. The fixed lower control arms provide up to 70 degrees of misalignment, dramatically reducing bind compared to factory JL components. Paired with triple-rate coil springs, the system provides a consistent 3.5 inches of lift while improving ride quality over factory linear-rate coils.
Front and rear track bar geometry corrections are included to properly center both axles, maintaining predictable handling on-road and stability off-road. Spring leveling pads further refine suspension geometry by reducing factory spring bow. Like all Rock Krawler Adventure Series systems, this kit is fully bolt-on and can be upgraded to a long-arm system as your build evolves.
✔ Clears up to 40” tires with proper configuration
✔ Excellent highway ride with serious trail performance
✔ Proven service-free joint technology
✔ Fully bolt-on mid-arm system with upgrade path
🛠 Installation
- Complete bolt-on installation
- Uses factory mounting locations
- No cutting or welding required
- Professional alignment required after installation
📌 Specs
📌 Key Features & Benefits
- 3.5" suspension lift for increased clearance and articulation
- Service-free Rock Krawler control arm joints
- Fixed lower control arms with 70° of misalignment
- Triple-rate coil springs improve ride comfort and load handling
- Front and rear spring leveling pads reduce factory spring bow
- Track bar geometry corrections center both axles
- Excellent highway ride with enhanced off-road control
- Upgradeable to Rock Krawler JL long-arm systems
- Lifetime warranty on all hard parts
📐 Specifications
- Product Type: Suspension lift system
- Series: Adventure Series
- Lift Height: 3.5 inches
- Control Arm Type: Mid-arm (fixed lowers)
- Joint Type: Service-free control arm joints
- Springs: Triple-rate coil springs
- Installation: Bolt-on
- Sold As: Complete system
- 🛞 Tire Fitment Guidelines
- Sport & Sahara (Full OEM Fenders)
- 37" tires (3" bump stop recommended)
- Sport & Sahara (Trimmed or High-Lined OEM Fenders)
- 38" tires (3" bump stop recommended)
- Rubicon (Full OEM Fenders)
- 37"–38" tires (3" bump stop recommended)
- Rubicon (Trimmed or High-Lined OEM Fenders)
- 40" tires (3" bump stop recommended)
- 🛞 Wheel Fitment Recommendations
- Sport & Sahara
- 37"–38" tires — 3.5" backspacing recommended
- Rubicon
- 37" tires — 4.5" backspacing
- 40" tires — 3.5" backspacing
📦 What’s Included
- Rock Krawler Adventure Series mid-arm suspension components
- Triple-rate front and rear coil springs (3.5" lift)
- Fixed lower control arms with service-free joints
- Front and rear spring leveling pads
- Front and rear track bar geometry correction components
- Required mounting hardware
🛡 Warranty
- Lifetime warranty on all hard parts
- Warranty coverage provided by Rock Krawler Suspension
⚠️ Fitment Notes
- Jeep Wrangler JLU (4-door) — 2018–Present
- Including Sport, Sahara, Rubicon, and XR Package models
⚠️ Fitment Notes
- Lift height based on Rubicon models with standard build weight
- XR Package models use factory raised rear track bar bracket
- Rear track bar bracket required on non-XR models when not included
- Rear lift height may vary based on bumper, spare tire, or overland load
- Spare delete builds may require 1" less rear lift
- Heavily loaded overland builds may require 1" additional rear lift
- Alignment required after installation