Dorman 43-1279 Leaf Helper Spring - Rear

Dorman 43-1279 Leaf Helper Spring for Super Duty Trucks

Dorman 43-1279 is a steel leaf helper spring built to match the fit and function of the original rear spring on select Ford heavy-duty trucks. It is engineered for durable, reliable performance and is sized for the specified application on 1999-2001 Ford F-250 Super Duty and F-350 Super Duty models.

Key Features

• OE-style replacement leaf helper spring for rear suspension service
• Steel construction with a black finish
• Measures 41.625 inches long, 3 inches wide, and 0.473 inches thick
• Rated for a 450 lb. load increase strength and 450 lb. maximum load rating
• Designed for 1999-2001 Ford F-250 Super Duty and 1999-2001 Ford F-350 Super Duty, rear
• Part number 43-1279 for direct identification and ordering

Detailed Description

This Dorman leaf helper spring is a direct-fit suspension component for rear applications on the 1999-2001 Ford F-250 Super Duty and Ford F-350 Super Duty. Built from steel and finished in black, it follows the original spring’s fit and function while providing the specified load support for heavy-duty rear suspension use. If you are searching for a rear leaf helper spring for Ford F-250 Super Duty or Ford F-350 Super Duty trucks, part number 43-1279 is the correct OE-style reference for this application.

This part cross-references Dorman OE Solutions 43-1279 for the same application.

What It Helps Address

• Rear suspension sag under load
• Reduced support from a worn or fatigued helper spring
• Uneven rear ride height on Super Duty trucks
• Loss of load-carrying support in heavy-duty use
• Noise or instability caused by a damaged rear spring component

Installation Notes and Tips

Verify rear fitment by year, model, and suspension configuration before installation. This leaf helper spring does not include mounting hardware, so reuse or source the required hardware separately as needed. Inspect adjacent suspension components, spring seats, and mounting points for wear or corrosion before completing the repair. Confirm the replacement matches the original dimensions and load rating for the vehicle.

Quality Assurance

Dorman designs this leaf helper spring to match original fit and function on the listed vehicles, with steel construction selected for durability and dependable service in rear suspension applications. Part number 43-1279 is cataloged for 1999-2001 Ford F-250 Super Duty and F-350 Super Duty rear fitment.