Hellwig 25301 LP-25/LP-35 Mounting Kit 2011-2025 Ford F-250/F-350/F-450/F-550

Vehicle Fitment

• 2011-2025 Ford F-250 Super Duty - All Trims, All Cab Styles (Regular Cab, SuperCab, Crew Cab, Cab & Chassis), SRW and DRW, 2WD/4WD
• 2011-2025 Ford F-350 Super Duty - All Trims, All Cab Styles (Regular Cab, SuperCab, Crew Cab, Cab & Chassis), SRW and DRW, 2WD/4WD
• 2016-2025 Ford F-450 Super Duty - All Trims, All Cab Styles (Regular Cab, Crew Cab, Cab & Chassis), SRW and DRW, 2WD/4WD
• 2016-2025 Ford F-550 Super Duty - All Trims, All Cab Styles (Regular Cab, Crew Cab, Cab & Chassis), SRW and DRW, 2WD/4WD

Fitment Notes

• SPRING LEAVES NOT INCLUDED: The Hellwig 25301 is a mounting hardware kit only. It does not include helper spring leaves. It must be paired with a compatible Hellwig LP-25 or LP-35 spring leaf kit - primarily part #2511 (LP-25, 2,500 lb.) or part #3511/3518 (LP-35, 3,500 lb.) - to complete the installation.
• FOR 3-INCH WIDE LEAF SPRINGS: This kit is specifically engineered for the 3-inch wide rear leaf springs used on 2011+ Ford Super Duty trucks. It is not interchangeable with the 25300 (older Dodge/Ford applications) or the 25250 (2.5" spring applications for GM trucks).
• Compatible with both SRW (single rear wheel) and DRW (dual rear wheel / dually) configurations across all applicable Ford Super Duty models and cab styles.
• FACTORY CONTACT OVERLOAD SPRINGS - CRITICAL NOTE: Factory contact overload springs must be removed before installing the 25301 mounting kit with LP helper spring leaves. If your Super Duty has factory contact overload springs and you prefer not to remove them, use the Hellwig Contact Overload Helper Spring Kit (part #9706 or #9712 for applicable F-250/F-350 model years) instead. Confirm your vehicle's spring configuration before ordering.
• The Hellwig 25301 product page currently confirms fitment through model year 2025. The paired spring leaf kit (#2511) is confirmed through 2026. If ordering for a 2026 Ford Super Duty, confirm the 25301 is appropriate for your truck with Hellwig at 1-800-HELLWIG (435-5944) before purchasing.
• For 2008-2010 Ford F-250/F-350 Super Duty, use mounting kit #25300 instead - the 25301 is specific to the 2011+ platform, which uses different spring geometry and axle bolt spacing.
• Compatible with all available Ford Super Duty engine options: 6.2L V8 (2011-2022), 7.3L V8 (2020+), 6.8L V8 (2023+), and 6.7L Power Stroke Diesel (2011+) across all applicable years.

Features

• Vehicle-specific bracket and U-bolt system engineered for the 2011+ Ford Super Duty's rear axle geometry and 3-inch wide leaf spring specification - mounts LP-25 and LP-35 helper spring leaves with no drilling, cutting, or modification to any factory component.
• Includes heavy-gauge steel axle mounting brackets with durable black powder coat finish - the primary interface between the LP helper spring leaves and the rear Super Duty axle housing.
• Includes large U-bolts that secure the helper spring leaves to the outer ends of the factory leaf spring pack, medium U-bolts that clamp the leaf assembly together at the center point, and small U-bolts that anchor the mounting brackets to the rear axle - all precisely sized for the 2011+ F-250/F-350/F-450/F-550 rear suspension.
• All hardware is zinc-plated for long-term corrosion resistance in road salt, mud, and water exposure - critical for underbody components on work trucks and fleet vehicles operating year-round.
• Compatible with both LP-25 (2,500 lb. capacity) and LP-35 (3,500 lb. capacity) helper spring leaf kits - one mounting kit serves the full Hellwig Load Pro spring lineup for the 2011+ Super Duty platform.
• Supports both SRW (single rear wheel) and DRW (dual rear wheel) axle configurations, including Cab & Chassis variants of the F-450 and F-550 - a broader compatibility range than the 25300 kit.
• Progressive rate design of the LP springs is adjustable at installation using the U-bolt hardware - independent side-to-side load rate adjustment for correcting uneven loads from camper placement, upfitter body weight, or off-center cargo.
• Bolt-on installation using common hand tools - no specialty tools, drilling, or permanent modifications to the factory leaf spring pack or axle hardware.
• Manufactured at Hellwig's ISO 9001 and ISO 14001 certified facility in Visalia, California - made in the USA, backed by Hellwig's Limited Lifetime Warranty.

Specifications

• Kit Type: LP Mounting Hardware Kit (hardware only - spring leaves sold separately)
• Leaf Spring Width: 3 inches (specific to 2011+ Ford Super Duty platform)
• Compatible Spring Series: LP-25 (2,500 lb.) and LP-35 (3,500 lb.)
• Drivetrain Compatibility: SRW and DRW (single and dual rear wheel)
• Bracket Finish: Black powder coat
• Hardware Finish: Zinc-plated
• Drilling Required: No
• Country of Manufacture: USA (Visalia, CA - ISO 9001 / ISO 14001 certified)
• Warranty: Limited Lifetime
• UPC: 745662253011

Included Components

• 2x Heavy-gauge steel axle mounting brackets, black powder coated
• Large U-bolts (secure helper spring leaves to outer ends of factory leaf spring pack), zinc-plated
• Medium U-bolts (secure leaf assembly at center point), zinc-plated
• Small U-bolts (secure mounting brackets to rear axle housing), zinc-plated
• All associated nuts, washers, plates, and fasteners, zinc-plated
• Installation instructions
• Note: Hellwig LP-25 or LP-35 spring leaf kit is NOT included and must be purchased separately (see parts #2511 or #3511/3518).

Product Description

The Hellwig 25301 Load Pro Install Kit is the required mounting hardware package for pairing Hellwig LP-25 and LP-35 helper spring leaf kits with 2011-2025 Ford F-250 and F-350 Super Duty trucks, and 2016-2025 Ford F-450 and F-550 Super Duty trucks. It cannot be used as a standalone product - the LP spring leaf kit (part #2511 for LP-25, or part #3511/3518 for LP-35) must also be purchased separately to complete the installation. Together, the spring leaves and the 25301 mounting kit form a complete, bolt-on load leveling upgrade with no drilling, cutting, or modification to factory components.

The 25301 is purpose-built for the 2011+ Ford Super Duty's specific rear suspension geometry, 3-inch wide leaf spring specification, and axle U-bolt spacing - it is not interchangeable with the older 25300 kit used on 2008-2010 Super Duty or Dodge/Ram applications. It includes heavy-gauge steel axle mounting brackets finished in black powder coat, along with three sets of zinc-plated U-bolts in different sizes that together clamp the helper spring leaves to the outer ends of the factory leaf pack, secure the center of the assembly, and anchor the brackets to the rear axle housing. The hardware works for all Ford Super Duty cab styles including Regular Cab, SuperCab, Crew Cab, and Cab & Chassis - and for both single rear wheel (SRW) and dual rear wheel (DRW/dually) axle configurations.

Factory contact overload springs must be removed before installing this kit and LP spring leaves. If a customer's Super Duty has factory contact overload springs and removing them is not preferred, Hellwig's Contact Overload Helper Spring Kit (part #9706 for 2016+ F-250/F-350 or part #9712 for 2024-2025 F-250/F-350) is the correct alternative. For 2026 Super Duty compatibility, verify with Hellwig directly at 1-800-HELLWIG (435-5944) before ordering, as the 25301 product page is currently confirmed through 2025. Manufactured at Hellwig's ISO 9001 and ISO 14001 certified facility in Visalia, California and backed by a Limited Lifetime Warranty.