The AEV 4" DualSport RT Suspension System for the JL Wrangler Unlimited is engineered to deliver maximum off-road capability without compromising on-road stability, steering precision, or overall vehicle control. As a fully integrated system, it accommodates up to 39" tires when paired with AEV Heavy Duty Adjustable Lower Control Arms, while preserving proper geometry, balanced ride quality, and predictable handling characteristics.
Unlike conventional lift kits that prioritize height over performance, the DualSport RT system focuses on optimized wheel travel, corrected steering geometry, and system-wide integration—resulting in a suspension system that performs cohesively in all driving conditions.
As with all of AEV’s expedition-ready suspension systems, the 4" DualSport RT Suspension System for the Jeep Wrangler JL is FMVSS No. 126 Compliant. FMVSS No. 126 is a rigorous standard set by the National Highway Traffic Safety Administration (NHTSA) that tests new electronic stability control (ESC) systems by subjecting it to various maneuvers designed to evaluate its effectiveness in preventing loss of control and skidding, including evasive lane-changing maneuvers at highways speeds.
Key Benefits
Increased Wheel Travel & 39" Tire Capability: The DualSport RT system is engineered to provide the wheel travel and clearance necessary to properly run up to 39" tires with OEM fender flares when paired with AEV Heavy Duty Adjustable Lower Control Arms or equivalent aftermarket front lower control arms that provide comparable tire clearance. This delivers improved articulation and off-road traction without sacrificing stability or requiring excessive lift height.
Balanced On-Road and Off-Road Performance: AEV’s approach prioritizes real-world drivability. By combining frequency-tuned springs with matched damping, this system delivers composed highway manners alongside enhanced off-road capability—eliminating the common trade-offs found in traditional lift kits.
Corrected Steering Geometry & Improved Control: The included AEV High Steer System addresses the limitations of factory steering components when paired with larger tires and increased ride height
Improved Steering Geometry: Raises steering linkages (tie rod by 2.75″, track bar/drag link by 2.5″) to correct geometry after lifting.
Enhanced Handling & Stability: Flattens drag link/track bar angles, reduces bump steer and body roll, and moves front roll center closer to the center of gravity.
Adjustable Steering Control: Features adjustable steering stops for fine-tuning lock-to-lock steering.
Durable Construction: Includes cast iron high steer knuckles, forged steel drag link, tie rod ends, and a chromoly tie rod.
Additionally, the high steer design improves ground clearance of critical steering components, reducing vulnerability in off-road environments.
Core Components & Engineering
AEV High Steer System
Cast iron steering knuckles
Heavy-duty tie rod and drag link
Machined steel steering damper mount
Increased steering component ground clearance
Geometry Correction Systems (Front & Rear)
Stamped steel front geometry correction brackets
Front and rear track bar relocation brackets
Rear control arm relocation brackets
Optimized suspension and steering angles for stability and handling
Frequency Tuned Triple-Rate Coil Springs
Progressive, triple-rate design for improved ride quality and load management
Maintains comfort during daily driving while supporting increased articulation off-road
AEV-Tuned Bilstein® 5100 Shock Absorbers
Specifically valved for the DualSport RT system
Provides consistent damping across varying terrain
Enhances control, stability, and ride refinement
AEV Steering Damper
Improves both the steering and handling by dampening minute movements and vibrations that are amplified in vehicles with larger tires.
Developed in partnership with Bilstein USA
Direct fit to the JL 4” Suspension
Additional Components
Extended sway bar end links
Bump stop extensions
AEV JL Jack base
AEV ProCal Snap
Why an Integrated System Matters
Every component in the DualSport RT Suspension System has been engineered to function together as a unified system. This eliminates the inconsistencies commonly associated with pieced-together lift kits and ensures:
Predictable handling characteristics
Improved durability and long-term reliability
Consistent performance across a wide range of driving conditions
The AEV 4" DualSport RT Suspension System sets a new standard for JL Wrangler suspension performance by combining increased wheel travel, corrected steering geometry, balanced ride quality, and up to 39" tire capability when paired with AEV Heavy Duty Adjustable Lower Control Arms. This fully integrated system is purpose-built for customers who want maximum off-road capability without sacrificing the refinement and control expected from an OEM-engineered system.
Important Fitment Notes
This suspension system requires wide-track axles, which are standard on Rubicon, Moab, and several other JL Wrangler trims.
Maximum wheel backspacing is 5.2" or less for 37x12.50 tires and 4.9" or less for 39x13.50 tires.
To accommodate 39" tires, sufficient clearance at full steering lock is required between the tire and the front lower control arm. Factory JL front lower control arms may limit tire clearance in this configuration. AEV Heavy Duty Adjustable Lower Control Arms, or equivalent aftermarket front lower control arms with a high-clearance bend profile, are required to achieve proper 39" tire fitment.
Technical Specs
Maximum wheel backspacing
37x12.5 tires: 5.2” or less
39x13.5 tires: 4.9” or less
Max tire size w/ factory flares 39x13.5” on AEV 17”x8.5” 0mm offset Borah and requires use of AEV Heavy Duty lower control arms for full tire clearance/travel during steering and articulation. Larger tires, such as the common 40x13.5 will require modifications to factory fender flares, wheel liners, potentially bumpers, etc.
Designed for a true 4” lift on a “typically equipped” offroad-capable Wrangler. This includes heavy duty steel bumpers, winch, tire carrier with full-size spare, and typical gear and cargo.
Approximate Total Vehicle Height w/ AEV 4” DualSport Suspension:
with 39” BFG KO3: 78.5”
with 37” BFG KO3: 77.5”
with 35” BFG KO3: 76.5”
*estimates have +/- 0.5” variance based on tire pressure and brand.
