Rough Country's 4.5-inch Coilover Conversion Radius Arm Lift Kit transforms your 2023-2026 4WD F-250 or F-350 Super Duty into a capable, aggressive off-road platform. The kit pairs fully adjustable Vertex coilovers with tubular radius arms and heavy-duty fabricated hardware to deliver serious lift and improved suspension geometry without gutting factory-like drivability. Running up to 35-inch tires becomes straightforward with the added clearance and corrected caster this system provides.
Vertex coilovers with external reservoirs at each corner. The 2.5-inch nitrogen-charged monotube Vertex coilovers feature external reservoirs that provide 56% more fluid capacity compared to standard units, keeping fluid temperatures lower and damping performance more consistent during extended off-road use. Ride height adjusts via the lower spring perch, letting owners dial in their preferred stance without swapping components.
Dual front shock configuration for added stability. A secondary V2 monotube shock at each front corner supplements the Vertex coilover, creating a dual-shock setup that improves front-end stability over rough terrain. The combination handles the suspension loads a lifted, heavily loaded Super Duty generates more effectively than a single shock per corner.
Tubular radius arms maintain suspension geometry. Heavy-wall tubular radius arms with a 2-inch outer diameter bolt directly to factory OEM mounts and correct caster angle after the lift. Precision-fit rubber bushings absorb vibration and reduce noise, keeping the ride composed on highway miles between trail runs.
Heavy-duty fabricated rear lift blocks. Fabricated steel rear lift blocks outperform cast alternatives in strength and resist deformation under load. Anti-axle wrap geometry built into the block design preserves factory ride behavior while controlling axle movement under hard acceleration. Optional V2 or Vertex rear shocks round out a matched four-corner performance setup.
Product Benefits
- 4.5-Inch Lift: Clears up to 35-inch tires and substantially increases ground clearance for off-road use.
- Adjustable Ride Height: Lower spring perch on Vertex coilovers allows fine-tuning of front stance.
- External Reservoir Coilovers: 56% more fluid capacity keeps damping consistent under sustained abuse.
- Dual Front Shocks: Secondary V2 monotube shock per side boosts front stability and control.
- Tubular Radius Arms: 2-inch OD arms correct caster and bolt to factory mounts.
- Anti-Axle Wrap Blocks: Fabricated rear blocks control axle movement without sacrificing ride quality.
- Front-to-Rear Leveling: Eliminates factory nose-down rake for a balanced, aggressive stance.
- OEM Mount Compatible: Radius arms and hardware bolt to factory locations.
- Limited Lifetime Replacement Warranty: Covered by Rough Country's standard warranty.
Note: Fits 2023-2026 4WD F-250 Super Duty and F-350 Super Duty with diesel engines only. Does not fit models equipped with a gas engine due to variances in motor weight. Does not fit models equipped with the Tremor Off-Road Package, which carry approximately a 1.5-inch factory lift. Does not fit dually models. Installation requires cutting and drilling for proper fitment. To ensure proper functionality of your Advanced Drive Assistance System (ADAS) and Light Detection and Ranging (LiDar) systems, recalibration may be necessary to retain proper functionality of these features.
About Rough Country: Rough Country engineers suspension lift kits, leveling kits, and off-road accessories for trucks and SUVs across a wide range of platforms. The brand focuses on delivering accessible off-road capability through kits that balance aggressive lift with real-world drivability and straightforward installation.
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Product Specifications & Vehicle Fitment
Review the product details and confirm compatibility with your vehicle before ordering.
| Specification | Details |
|---|---|
| Vehicle Fitment | 2023, 2024, 2025, 2026 |
