Running a diesel-powered 2017-2022 F-250 or F-350 Super Duty on 4WD and wanting serious lift height without gutting your ride quality is a tall order. Rough Country's 4.5-inch Coilover Conversion Lift Kit answers it by replacing the factory independent coil setup with a purpose-built coilover system, giving your Super Duty the clearance to run up to 35-inch tires while keeping suspension geometry dialed in close to factory angles.
Vertex coilovers built for serious duty. The heart of this kit is Rough Country's 2.5-inch piston, nitrogen-charged Vertex coilover featuring a monotube design with an external reservoir. That reservoir delivers increased oil capacity and damping sensitivity compared to a standard shock setup. The 2.5-inch piston design provides 56% greater fluid capacity than the average reservoir shock, and an 8-stage adjuster lets you tune compression and rebound to match your load, terrain, and driving style.
Radius arm drop brackets preserve caster and drivability. Proper caster is critical on a lifted truck; without it, you fight the steering wheel and wear tires unevenly. Rough Country's ultra-durable radius arm drop brackets bolt directly into the factory mounts, correcting caster to a near-factory angle so the Super Duty continues to track straight and handle predictably after the lift.
Fabricated rear blocks resist axle wrap. The rear of the kit uses specially designed anti-axle wrap blocks fabricated from steel rather than cast material. Fabricated blocks are stronger and outlast cast alternatives, and the anti-wrap geometry eliminates the spring wind-up that commonly plagues lifted trucks under acceleration, maintaining stock-like rear ride quality.
Configurable to your specific axle and shock preference. This kit offers fitment for either a 3.5-inch or 4-inch axle, a choice between V2 monotube or Vertex reservoir shocks, and an optional front driveshaft add-on. Select the combination that matches your truck's axle size and your performance expectations before ordering.
Product Benefits
- 4.5-Inch Lift: Clears up to 35-inch tires on 2017-2022 Super Duty Diesel 4WD models.
- 2.5in Vertex Coilovers: Monotube design with external reservoir and 8-stage adjustability for tunable ride quality.
- 56% Greater Fluid Capacity: Larger piston and reservoir outperform average reservoir shocks on damping consistency.
- Radius Arm Drop Brackets: Bolt-in design corrects caster to near-factory angles for proper handling and tire wear.
- Anti-Axle Wrap Rear Blocks: Fabricated steel construction eliminates spring wind-up and outlasts cast alternatives.
- Configurable Kit Options: Choose 3.5-inch or 4-inch axle fitment, V2 or Vertex shocks, and optional front driveshaft.
- Limited Lifetime Replacement Warranty: Covers manufacturer defects in structural integrity and workmanship.
Note: Fits 2017-2022 4WD F-250 Super Duty and F-350 Super Duty Diesel models only. Does NOT fit gas engine models. Does NOT fit dually models. Does NOT fit manual shift transfer cases. Fits ONLY models equipped with rear factory contact overload springs. Does NOT work on models equipped with the Tremor Factory Trim Package. Models equipped with a 10-speed transmission must remove the dial pin. Installation requires cutting and drilling; estimated installation time is 6-10 hours.
About Rough Country: Rough Country designs and manufactures suspension lift kits, leveling kits, and off-road accessories for trucks and SUVs across a wide range of domestic and import platforms. The brand focuses on bolt-in and minimally modified fitments that deliver increased ground clearance without requiring extensive fabrication, and backs its suspension products with a limited lifetime replacement warranty.
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Product Specifications & Vehicle Fitment
Review the product details and confirm compatibility with your vehicle before ordering.
| Specification | Details |
|---|---|
| Vehicle Fitment | 2017, 2018, 2019, 2020, 2021, 2022 |
