ICON 1999-2026 Ford F-250/F-350 Super Duty Rear 4-Inch Block Kit

The ICON Vehicle Dynamics Rear 4-Inch Block Kit adds 4 inches of rear lift height to 1999–2026 Ford F-250 and F-350 Super Duty trucks using a square, non-tapered block design fabricated from CNC laser cut and brake-formed steel plate with heavy-duty .250-inch wall square tubing. Note that this kit does not fit 2023–2025 F-350 trucks equipped with dual rear wheels, and U-bolts are not included.

Shipping: ICON parts ship direct from ICON Vehicle Dynamics, mostly by UPS Ground. Lead times vary by part and some items are built to order, so please allow extra time. We email tracking as soon as your order ships.

Built for Towing and Off-Road Stress

The block is fabricated from CNC laser cut steel plate combined with .250-inch wall square tubing, sized for the real-world loads a Super Duty sees: heavy trailer tongue weight, payload hauling, and the repeated compression cycles of off-road driving. A block that flexes or cracks under those conditions can shift axle alignment and damage surrounding hardware; the fabricated steel construction is chosen specifically to resist those stresses over the long term.

Bump Stop Protection Built In

A reinforced bump stop tang is integrated into the block to maintain proper bump stop engagement at full suspension compression. Without correct engagement, a lifted rear end can bottom out against the shock body or shock mounts, causing premature wear or outright damage. The tang limits compression travel so the suspension cycles through its full range without that contact, whether the truck is loaded to capacity or running unladen on rough terrain.

Finish and Appearance

The blocks ship with a semi-gloss black powder coat finish that resists corrosion and holds up to the undercarriage environment. The square block profile also presents a cleaner visual line than tapered alternatives when viewed from the rear of the truck.

Features

• 4-inch lift height: vehicle-specific square, non-tapered block design
• Fabricated steel construction: CNC laser cut and brake-formed steel plate with .250-inch wall square tubing
• Reinforced bump stop tang: limits compression travel to protect rear shocks and shock mounts
• Semi-gloss black powder coat: corrosion-resistant finish

Specifications

Who This Is For and Isn't

This block kit suits 1999–2026 Ford F-250 and F-350 Super Duty owners who want a straightforward 4-inch rear lift and need a block rated for the towing, hauling, and off-road demands those trucks regularly see.

This kit does not fit 2023–2025 F-350 trucks with dual rear wheels. U-bolts are not included; the correct U-bolt kit must be selected separately based on model year and leaf spring configuration. Installation requires recalibration of Advanced Driver Assistance Systems (ADAS) after the lift is complete. California residents: this product contains chemicals known to the State of California to cause cancer, birth anomalies, or other reproductive harm (Proposition 65).

Common Questions

Do U-bolts come with this kit?

U-bolts are not included with the ICON 4-Inch Rear Block Kit. The correct U-bolt kit must be purchased separately; the appropriate U-bolts depend on the truck's model year and leaf spring configuration. ICON offers compatible U-bolt kits for 1999–2010 F-250/F-350 (SRW) and Excursion, and for 2011–2026 F-250/F-350 Super Duty.

Will this kit fit a 2024 F-350 with dual rear wheels?

No. The ICON 4-Inch Rear Block Kit does not fit 2023–2025 F-350 trucks equipped with dual rear wheels. It is compatible with single rear wheel Super Duty configurations within the 1999–2026 model year range.

Does installing this block kit require any recalibration?

Yes. Installing the ICON 4-Inch Rear Block Kit requires recalibration of Advanced Driver Assistance Systems (ADAS) after the lift is complete. This applies to any equipped Super Duty and should be performed by a qualified installer or dealer with the appropriate scan tool.

What is the block made from?

The ICON 4-Inch Rear Block Kit is fabricated from CNC laser cut and brake-formed steel plate combined with heavy-duty .250-inch wall square tubing. The square, non-tapered profile is designed to handle the compression loads of heavy towing, hauling, and off-road use without flexing or shifting.