4.5" Lift Stage 4 Suspension System Kit w/ Radius Arms & Expansion Packs

Features:

• 4.5" front lift for diesel Super Duty trucks
• 2" rear lift from leaf expansion packs
• Dual-rate front coils balance ride and control
• Radius arms improve strength and caster geometry
• No drop brackets required for front suspension
• Remote reservoir shocks reduce heat and fade
• Up to 50% more front wheel travel
• Adjustable track bar improves steering and alignment
• Dual steering stabilizers control tire feedback
• Stainless steel brake lines resist heat and wear
• Shocks are rebuildable and fully re-tunable
• Backed by ICON lifetime component warranty

Get More Out Of Your Super Duty Every Day

If your Super Duty is already putting in work, it’s time to give it a suspension that matches its capability. The ICON K65903RL 4.5" Stage 4 System with Radius Arms and Expansion Packs isn’t just for show, it’s built to take on long workdays, weekend wheeling, and everything in between. You get a full 4.5 inches of lift in the front and 2 inches in the rear using ICON’s leaf expansion packs, which ride smoother and perform better under load than traditional lift blocks. The dual-rate coil springs provide a noticeable difference in comfort during daily driving, while still keeping your suspension tight and responsive off-road or when hauling heavy gear. Custom-tuned remote reservoir shocks help control heat and maintain consistent damping, so the truck stays planted and composed even during hard use. Up front, you’ll feel the benefit of ICON’s fabricated radius arms, which improve steering clearance, correct alignment, and increase strength where it counts. From job sites to backroads, this system keeps your truck riding better, handling sharper, and looking like it’s ready for anything.

Precision Matched Suspension Designed For Real Demands

The ICON Stage 4 Suspension System with radius arms and expansion packs is engineered to deliver complete suspension performance for 2023-2025 Ford Super Duty diesel trucks. Dual-rate front coils are specifically tuned for diesel weight, offering a soft initial ride that transitions into a firmer second rate to handle compression loads and resist bottoming out. The included remote reservoir 2.5 Aluminum Series shocks expand fluid capacity and surface area to control temperatures during extended off-road driving or heavy towing. Rear lift is handled through ICON’s leaf expansion packs, which reduce axle wrap and improve bump compliance compared to block-style lifts. The fabricated radius arms come pre-fit with caster cams for precise on-vehicle adjustment while also eliminating the need for bulky drop brackets. Steering geometry is corrected with a track bar drop bracket, while the adjustable track bar keeps the axle centered and stable under all conditions. The full system includes extended stainless steel brake lines, sway bar drop brackets, and bump stop spacers to round out a kit that’s designed to function as a complete, high-performance upgrade, not just a basic lift.

Fits: 2023, 2024, 2025 Ford F250/F350 Super Duty DIESEL

Notes:

• Only compatible with 4WD diesel F-250 and F-350 models.
• Not designed for gas trucks or Cab & Chassis models.
• Radius arms include built-in caster adjustment cams.
• No drop brackets needed, which improves ground clearance.
• Rear lift uses expansion packs, not lift blocks.
• System provides up to 50% more front wheel travel.
• Remote reservoir shocks help manage heat during heavy use.
• Includes stainless steel braided front brake lines.
• All shocks and stabilizers are rebuildable and tunable.
• Precision components are CNC machined and laser cut.
• OEM wheels and tires may be reused in most setups.
• Backed by ICON’s lifetime warranty on key components.