Hellwig 2511 LP-25 Helper Spring Kit 2011-2026 Ford F-250/F-350/F-450/F-550 SD

Vehicle Fitment

• 2011-2026 Ford F-250 Super Duty - All Trims, All Cab Styles, SRW and DRW, 2WD/4WD - 6.2L V8, 7.3L V8 (2020+), 6.7L Power Stroke Diesel
• 2011-2026 Ford F-350 Super Duty - All Trims, All Cab Styles, SRW and DRW, 2WD/4WD - 6.2L V8, 7.3L V8 (2020+), 6.7L Power Stroke Diesel
• 2016-2026 Ford F-450 Super Duty - All Trims, All Cab Styles, SRW and DRW, 2WD/4WD - 6.7L Power Stroke Diesel (standard), 6.8L V8 and 7.3L V8 (2023+)
• 2016-2025 Ford F-550 Super Duty - All Trims, All Cab Styles, SRW and DRW, 2WD/4WD - 6.7L Power Stroke Diesel (standard), 6.8L V8 and 7.3L V8 (2023+)

Fitment Notes

• MOUNTING KIT REQUIRED - SOLD SEPARATELY: The Hellwig 2511 is the spring leaf assembly only. The LP Mounting Hardware Kit #25301 must be purchased separately and is required for installation. The 2511 cannot be installed without it.
• FACTORY CONTACT OVERLOAD SPRINGS - CRITICAL NOTE: 2016 and newer Ford Super Duty trucks equipped with the available Super Duty payload packages may have factory contact overload springs on the rear leaf pack. If your truck has factory contact overload springs, you must either: (a) remove the factory contact overload springs before installing the 2511, or (b) purchase the Hellwig Contact Overload Helper Spring Kit (e.g., part #9706 for 2016-2026 F-250/F-350 SD) in place of the 2511, which is specifically designed to augment - rather than replace - factory overload springs. Installing the 2511 directly over factory contact overload springs without removal will result in improper fitment. Verify your truck's spring configuration before ordering.
• 2011-2015 Ford F-250 and F-350 Super Duty trucks generally do not have factory contact overload springs and are straightforward 2511 installations.
• Compatible with all cab styles (Regular Cab, SuperCab, Crew Cab) and all bed lengths - cab and bed configuration do not affect rear leaf spring helper fitment.
• Compatible with both SRW (single rear wheel) and DRW (dual rear wheel / dually) configurations - unlike Hellwig's EZ-series helper springs, the LP-25 is confirmed to work with both SRW and DRW Super Duty trucks.
• Compatible with all available drivetrains (2WD and 4WD) and all engine options across applicable model years.
• The F-550 fitment is confirmed through 2025 per Hellwig's current product page; confirm 2026 F-550 fitment directly with Hellwig at 1-800-HELLWIG (435-5944) before ordering.

Features

• Up to 2,500 lb. level load carrying capacity - ideal for 3/4-ton and 1-ton Super Duty applications that consistently operate under heavy payload, fifth-wheel, or gooseneck loads at or near the truck's GVWR.
• Progressive rate design - the spring rate increases proportionally as the rear load compresses the factory leaf pack, so the 2511 is completely transparent during unloaded and lightly loaded driving, then activates progressively as payload weight builds. No added harshness or bounce when running empty.
• 3-leaf multi-leaf assembly spans both sides of the rear axle for superior bilateral support, consistent side-to-side leveling, and reduced body roll and sway under heavy trailer tongue weight or bed loads.
• Fully adjustable load rate - the LP-25 mounting hardware provides independent left and right adjustment via U-bolts and brackets, allowing the effective load rate to be tuned for uneven loads (e.g., off-center truck camper mount, upfitter body, or one-sided tool storage).
• Each spring leaf is hot-formed and heat-treated from ASTM 5160 alloy spring steel - delivering maximum strength, fatigue resistance, and long-term durability under sustained heavy daily use.
• Black powder coat finish over all steel components for corrosion resistance in road salt, diesel exhaust residue, and wet-weather environments.
• Eliminates rear-end squat and sag that degrades headlight aim, front-axle traction, steering precision, trailer stability, and brake performance - common issues when Super Duty trucks haul at or near rated payload capacity.
• Reduces leaf spring wrap-up and axle hop under heavy acceleration loads - critical for work trucks, fleet operators, and truck camper owners who load and unload frequently.
• "Set it and forget it" design - once installed and adjusted, the LP-25 requires zero ongoing maintenance. No air lines, compressors, sensors, or electronics to service, leak, or fail.
• No drilling, cutting, or permanent modifications required for installation using common hand tools.
• Manufactured at Hellwig's ISO 9001 and ISO 14001 certified facility in Visalia, California - made in the USA since 1946, backed by Hellwig's Limited Lifetime Warranty against manufacturing defects.

Specifications

• Level Load Capacity: Up to 2,500 lbs.
• Spring Series: LP-25 (Load Pro 25)
• Spring Rate Design: Progressive Rate
• Construction: 3-leaf multi-leaf assembly
• Spring Material: ASTM 5160 heat-treated alloy spring steel
• Spring Finish: Black powder coat
• Drivetrain Compatibility: SRW and DRW (single and dual rear wheel)
• Mounting Kit: Required - sold separately (Mounting Hardware Kit #25301)
• Drilling Required: No
• Country of Manufacture: USA (Visalia, CA - ISO 9001 / ISO 14001 certified)
• Warranty: Limited Lifetime
• Quantity: Sold as a kit (spring leaves only - mounting hardware sold separately)

Included Components

• 2x LP-25 3-leaf spring assemblies (1 per side), ASTM 5160 alloy steel, black powder coated
• Installation instructions
• Note: LP Mounting Hardware Kit #25301 is NOT included and must be purchased separately for installation.

Product Description

The Hellwig 2511 LP-25 Progressive Rate Load Leveler Helper Springs are Hellwig's heavy-duty load management solution for the 2011-2026 Ford F-250 and F-350 Super Duty, and the 2016-2026 Ford F-450 and 2016-2025 Ford F-550 Super Duty. Rated to 2,500 lbs. of supplemental rear load capacity, the LP-25 is the workhorse of Hellwig's helper spring lineup - purpose-built for 3/4-ton and 1-ton applications where fleet trucks, work-spec units, and heavy tow vehicles operate at or near their Gross Vehicle Weight Rating on a regular basis. The progressive rate design means the springs lie dormant during unloaded daily driving, engaging progressively as the factory leaf pack begins to compress under payload weight. This preserves the F-250/F-350's stock ride character when empty while delivering firm, controlled support exactly when the load demands it.

The 2511 uses a 3-leaf multi-leaf assembly design that runs over both sides of the rear axle - unlike simpler single-leaf designs - providing superior lateral stability, reduced body roll, and more precise side-to-side leveling under uneven loads. The required LP Mounting Hardware Kit #25301 (sold separately) provides the vehicle-specific brackets, U-bolts, and hardware needed for installation and includes independent left/right adjustment capability for correcting off-center loads from truck campers, upfitter bodies, gooseneck setups, or asymmetric cargo. Each spring leaf is hot-formed and heat-treated from ASTM 5160 alloy spring steel and finished in black powder coat. Once installed and adjusted, the LP-25 is a completely maintenance-free, zero-electronics solution - no air bags, compressors, or sensors to maintain, fail, or leak during a long haul.

Before ordering, verify your truck's rear spring configuration. Ford Super Duty trucks from 2016 onward in higher payload configurations may have factory contact overload springs - these must be removed prior to installing the 2511, or the Hellwig Contact Overload Helper Spring Kit (e.g., part #9706 for 2016+ F-250/F-350) should be used instead. 2011-2015 F-250 and F-350 trucks typically do not have factory contact overload springs and are a straightforward bolt-on installation. The 2511 is compatible with both SRW and DRW configurations, all cab and bed combinations, all available drivetrains (2WD and 4WD), and all engine options across all applicable model years. Manufactured at Hellwig's ISO 9001 and ISO 14001 certified factory in Visalia, California and backed by a Limited Lifetime Warranty for the original purchaser on the original vehicle.