ICON 1999-2026 Ford F-250/F-350 Super Duty Rear 5-Inch Block Kit

The ICON Vehicle Dynamics 5" Rear Block Kit adds 5 inches of rear lift height to 1999–2026 Ford F-250 and F-350 Super Duty trucks (single rear wheel configurations) using a square, non-tapered block design fabricated from CNC laser-cut and brake-formed steel plate and heavy-duty .250" wall square tubing. U-bolts are not included and must be sourced separately to match the vehicle's year and leaf-spring configuration.

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 Trail Duty

The square block geometry and .250" wall square tubing construction are sized to handle the cyclic stress of heavy towing and hauling loads as well as repeated off-road impacts. CNC laser cutting and brake-forming hold the block dimensions to consistent tolerances, so the block seats squarely on the leaf-spring pack without shimming or improvisation. That consistency matters on a work truck where an uneven block can introduce axle misalignment under load.

Bump Stop Protection Built In

A reinforced bump stop tang is integrated into the block to engage the factory bump stop at full suspension compression. This limits downward shock travel and prevents the rear shocks and shock mounts from bottoming out during hard off-road impacts or when the truck is loaded. The tang is part of the fabricated assembly, not a bolt-on afterthought, so it stays aligned with the bump stop across the block's service life.

Finish and Fitment

A semi-gloss black powder coat finish provides corrosion resistance for underbody exposure. The block is vehicle-specific to the F-250/F-350 Super Duty platform across the full 1999–2026 model-year range, with the fitment exceptions noted below.

Features

• 5" overall height: vehicle-specific, square non-tapered block design
• CNC laser-cut and brake-formed construction: steel plate and .250" wall square tubing
• Reinforced bump stop tang: limits compression travel to protect rear shocks and mounts
• Semi-gloss black powder coat: corrosion-resistant finish
• U-bolts not included: installer selects appropriate U-bolts for the vehicle's year and leaf-spring configuration

Specifications

Who This Is For and Isn't

This block kit suits owners of 1999–2026 Ford F-250 or F-350 Super Duty trucks with single rear wheels who want 5 inches of rear lift and need a block that can handle towing, hauling, and off-road use without sacrificing bump stop protection.

This kit does not fit 2023–2025 F-350 trucks equipped with dual rear wheels. U-bolts are not included; the appropriate U-bolts must be selected based on the vehicle's model year and leaf-spring configuration. Installation requires recalibration of Advanced Driver Assistance Systems (ADAS) after the lift is complete.

Common Questions

Are U-bolts included with this block kit?

U-bolts are not included with the ICON 5" Rear Block Kit. The installer must select and source the appropriate U-bolts based on the vehicle's model year and leaf-spring configuration. ICON offers compatible U-bolt kits separately for 1999–2010 Super Duty/Excursion and 2011–2026 Super Duty applications.

Does this kit fit F-350 trucks with dual rear wheels?

No. Per ICON Application Note #213, this 5" Rear Block Kit will not fit 2023–2025 Ford F-350 trucks equipped with dual rear wheels. It is compatible with single rear wheel configurations across the 1999–2026 model-year range.

Does installing this block kit require any recalibration?

Yes. Per ICON Application Note #155, installation of this rear block kit requires recalibration of the vehicle's Advanced Driver Assistance Systems (ADAS) after the lift is complete. This step should be performed by a qualified installer with the appropriate calibration equipment.

What is the purpose of the bump stop tang on these blocks?

The reinforced bump stop tang integrated into the ICON 5" Rear Block Kit engages the factory bump stop at full suspension compression, limiting downward shock travel. This prevents the rear shocks and shock mounts from bottoming out during hard off-road impacts or when the truck is loaded.

Is there a California Proposition 65 warning for this product?

Yes. This product contains chemicals known to the State of California to cause cancer, birth anomalies, or other reproductive harm. This warning applies to California residents as required by Proposition 65.