Video: 2005-2022 Ford F-250/F-350 4.5-6" Coil Over Conversion Kit
Rough Country

6 Inch Coilover Conversion Lift Kit | Radius Arm | Ford F-250/F-350 Super Duty (2023-2026)

Part #: 400458-configCategory: Suspension Lift Kits

Sold & installed by an Authorized Rough Country Dealer

Does it fit? Listed for 2 vehicles (Ford). Pick your vehicle to check.

  • Adjustable Ride Height
  • Superior Ride Quality
  • Enhanced Damping Control
  • Dual Front Shocks

Install time: 6-10 hoursDue to variances in motor weight, this kit does NOT fit models equipped with a gas engine.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.

Call or request a quote for today’s price and installation.

  • Authorized Rough Country dealer
  • Installed at our Silver Star Rd shop
  • No-credit-needed financing

About the 6 Inch Coilover Conversion Lift Kit | Radius Arm | Ford F-250/F-350…

Conquer with Confidence: Elevate your fifth-generation Ford Super Duty with Rough Country's 6-Inch Coilover Suspension Lift Kit. Built for off-road warriors and everyday drivers alike, this performance-driven upgrade delivers aggressive ride height without sacrificing comfort. Run up to 37-inch tires and take command of any terrain with confidence and control.

Adjustable Performance, Superior Ride: Fine-tune your stance with fully adjustable Vertex coilovers designed for maximum clearance and responsiveness. These 2.5-inch, nitrogen-charged monotube coilovers feature external reservoirs offering 56% more fluid capacity for cooler, more consistent performance. A secondary V2 monotube shock at each front corner creates a dual-shock setup that enhances stability and control on every journey.

Stronger by Design: Heavy-duty 1/4-inch fabricated coilover mounts ensure maximum strength and durability under the harshest conditions. Tubular radius arms feature a massive 2-inch outer diameter, precision-fit for OEM mounts, maintaining a factory-like suspension angle while delivering unmatched strength. Durable rubber bushings help absorb vibration, promoting a smoother, quieter ride on or off the road.

Enhanced Rear Suspension: Heavy-duty fabricated lift blocks outperform cast alternatives in strength and reliability. Anti-axle wrap rear blocks preserve factory ride quality while eliminating unwanted axle movement. For all-terrain control, upgrade with optional V2 or Vertex rear shocks to complete a four-corner performance package.

Hassle-Free Installation: This system is fully bolt-on, no cutting or drilling required. Top-mounted reservoir brackets ensure clean, secure placement, while front-to-rear leveling eliminates factory rake for a more aggressive, balanced stance. Boosted ground clearance improves off-road capability, and enhanced suspension geometry keeps your Super Duty performing at its best.

Backed by Confidence: Covered by Rough Country's Limited Lifetime Replacement Warranty, this 6-Inch Coilover Lift Kit offers peace of mind with every mile. Drive harder. Ride smoother. Lift smarter with Rough Country.

Notes

  • Due to variances in motor weight, this kit does NOT fit models equipped with a gas engine.
  • 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.
  • Does NOT ft models equipped with Tremor Off-Road Package as they are equipped with approximately a 1.5-inch factory lift.
  • Does NOT fit dually models.

Features

  • Adjustable Ride Height: Fine-tune your vehicle's stance and clearance with fully adjustable coilovers.
  • Superior Ride Quality: Enjoy a smoother, more responsive ride with performance-tuned suspension.
  • Enhanced Damping Control: Coilover conversion dramatically boosts damping capability for better handling.
  • Dual Front Shocks: Includes a secondary V2 front monotube shock for increased stability and control.
  • Heavy-Duty Coilover Mounts: Features 1/4-inch fabricated mounts for maximum strength and durability.
  • Convenient Reservoir Mounting: Comes with a top-mounted reservoir bracket for clean, secure installation.
  • Simple Bolt-On Setup: No cutting or drilling required for a hassle-free installation.
  • Boosted Ground Clearance: Gain extra height to tackle off-road terrain with confidence.
  • Front-to-Rear Leveling: Corrects factory rake by aligning the front suspension height with the rear.
  • Precision Caster Correction: Includes tubular radius arms to ensure proper caster settings, preserving factory-like handling and stability.
  • Tubular Radius Arms: Engineered for strength and performance with a 2" outer diameter design.
  • Factory-Mount Compatible: Precision-fit to bolt directly into OEM mounts for hassle-free installation.
  • Improved Geometry: Designed to maintain a more factory-like suspension angle.
  • Heavy-Duty Construction: Oversized arms offer superior strength compared to stock components.
  • Durable Rubber Bushings: Reduce noise and absorb vibrations for a smoother ride.
  • Heavy-Duty Fabricated Blocks: Built tougher than cast alternatives for superior strength and long-term durability.
  • Anti-Axle Wrap Rear Blocks: Custom-designed to retain factory ride quality while eliminating common axle wrap issues.
  • Enhanced Shock Compatibility: Pair with V2 or Vertex rear shocks for four-corner performance and smoother ride control.

What’s in the Box

Front

  • Vertex Coilovers
  • Tubular Radius Arms
  • Sway-Bar Drop Brackets
  • Track Bar Drop Bracket
  • Stabilizer Relocation Brackets
  • Pitman Arm
  • Brake Line Brackets
  • Bumpstop Spacers
  • Hardware

Rear

  • Fabricated Anti-Wrap Lift Blocks
  • Carrier Bearing Drop Bracket
  • Brake Line Brackets
  • U-Bolts
  • Hardware

Shocks

  • (2) V2 Monotube Shocks

Specifications

Specifications for the 6 Inch Coilover Conversion Lift Kit | Radius Arm | Ford F-250/F-350 Super Duty (2023-2026)
BrandRough Country
TypeSuspension Lift Kits
Part number400458-config
Est. Install Time6-10 hours

Vehicle Fitment

2 vehicles listed by Rough Country. Always confirm drive type and trim before you order.

Vehicles the 6 Inch Coilover Conversion Lift Kit | Radius Arm | Ford F-250/F-350 Super Duty (2023-2026) fits
YearsMakeModelDetails
2023–2026FordF-250 Super Duty4WD
2023–2026FordF-350 Super Duty4WD

Video

2005-2022 Ford F-250/F-350 4.5-6" Coil Over Conversion Kit

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