ICON Stage 4 Suspension System with Radius Arms for 2023-2026 Ford F-250/F-350 Super Duty 4WD Diesel 4.5-Inch Lift

The ICON Vehicle Dynamics Stage 4 Suspension System (SKU K65903R) is a complete 4.5-inch lift solution engineered specifically for 2023–2026 Ford F-250 and F-350 Super Duty trucks equipped with 4WD and a diesel engine, delivering approximately 50% more front wheel travel than stock and a vehicle-specific tune across every shock in the kit.

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Dual-Rate Springs Built for Diesel Weight

The 4.5-inch front coil springs use a dual-rate design: a softer initial rate absorbs everyday road imperfections and keeps the cab comfortable during highway and towing miles, while a firmer secondary rate engages progressively under compression to resist bottoming on rough terrain. Because the springs are rated specifically for diesel engine weight, the ride height and spring behavior reflect the actual front-axle load of a diesel-equipped Super Duty rather than a generic heavy-truck approximation.

Fabricated Radius Arms and Corrected Steering Geometry

Fabricated radius arms replace the OE units with stronger construction, built-in caster cams for on-vehicle caster adjustment, maintenance-free bushings, and improved tire clearance at full steering lock. By eliminating drop brackets, the arms raise ground clearance under the chassis rather than consuming it. A fabricated track bar drop bracket re-centers the axle under the frame and removes the geometry error that causes bump steer at lifted ride heights. An adjustable track bar lets the installer fine-tune track alignment on the vehicle and eliminates the deflection introduced by OE rubber track bar bushings, producing a more direct and predictable steering feel.

2.5 Series Remote Reservoir Shocks Front and Rear

ICON 2.5 Aluminum Series remote reservoir shocks handle both front and rear damping duties. Remote reservoirs increase shock oil volume and heat-dissipation surface area, resisting the fade and cavitation that occur when shocks overheat under sustained hard use. The hard-anodized shock bodies and 7/8-inch shafts resist corrosion, and every shock in the kit is fully rebuildable and re-tunable. A dual opposing steering stabilizer kit using ICON 2.0 Aluminum Series shocks (5/8-inch shafts, anodized bodies) adds a second layer of damping to control the steering feedback that larger tires introduce.

Features

• 4.5-inch front lift: dual-rate coil springs rated for diesel engine weight
• Approximately 50% more front wheel travel: over stock configuration
• Fabricated radius arms: on-vehicle caster adjustment, maintenance-free bushings, no drop brackets required
• Bump steer correction: fabricated track bar drop bracket and adjustable track bar included
• ICON 2.5 Aluminum Series remote reservoir shocks: front and rear, vehicle-specific tune, fully rebuildable
• Dual opposing steering stabilizers: ICON 2.0 Aluminum Series, corrosion-resistant anodized bodies
• 5-inch fabricated rear lift blocks and 15-inch U-bolt kit: rated for heavy towing and off-road stress
• Box kit included: fabricated front sway bar drop brackets, aluminum bump stop spacers, stainless steel extended brake lines
• Lifetime guarantee: coil springs are covered against breakage or sagging; fabricated components are covered against breakage or defect

Specifications

WARNING: This product contains chemicals known to the State of California to cause cancer, birth anomalies, or other reproductive harm (California Proposition 65).

Who This Is For and Isn't

This system suits owners of 2023–2026 Ford F-250 or F-350 Super Duty trucks with 4WD and a diesel engine who want a 4.5-inch lift with meaningfully improved ride quality, corrected steering geometry, and the shock capacity to handle sustained towing, job-site use, and off-road driving without damper fade.

This system does not fit F-350 Cab and Chassis models, dual rear wheel configurations, gas-engine Super Duty trucks, or 2WD models. Trucks equipped with the Tremor package will see approximately 3.5 inches of front lift rather than 4.5 inches. Trucks equipped with Ford's OnBoard Scales system require a separate sensor bracket (ICON part 66204, sold separately). ADAS recalibration is required after installation on any equipped vehicle.

Common Questions

Does this kit fit a gas-engine F-250 or F-350?

No. The ICON Stage 4 K65903R system includes coil springs rated specifically for diesel engine weight. A gas-engine Super Duty requires a different spring kit; this system is not compatible with gas-powered F-250 or F-350 trucks.

Will this fit a dual rear wheel (DRW) Super Duty?

No. The ICON Stage 4 K65903R system is designed for single rear wheel models only. Dual rear wheel F-350 configurations are not a supported fitment for this kit.

What lift height should a Tremor package owner expect?

Trucks equipped with the Ford Tremor package will achieve approximately 3.5 inches of front lift with this system rather than the standard 4.5 inches, due to the Tremor's different factory suspension geometry. Rear lift from the fabricated 5-inch blocks is not affected by the Tremor package.

Is ADAS recalibration required after installing this suspension system?

Yes. The ICON Stage 4 K65903R system requires recalibration of Advanced Driver Assistance Systems after installation on any vehicle equipped with ADAS. This is a post-install requirement regardless of which ADAS features the truck carries.

What do the remote reservoir shocks do differently from standard shocks?

The ICON 2.5 Aluminum Series remote reservoir shocks used in this system carry a larger volume of shock oil in an external reservoir, which increases heat-dissipation surface area. Under sustained hard use such as extended off-road driving or repeated heavy towing, this reduces the risk of overheating, cavitation, and the damper fade that follows.

Do the shocks require any special maintenance or can they be serviced?

All shocks included in the ICON Stage 4 K65903R system are fully rebuildable and re-tunable. The 2.5 Aluminum Series units use hard-anodized bodies and 7/8-inch shafts; the 2.0 Aluminum Series steering stabilizers use anodized bodies and 5/8-inch shafts.