Help your rear suspension carry its load as designed with the Dorman - OE Solutions Leaf Helper Spring, part number 43-1749HD, a direct replacement for a worn or failed rear helper leaf. It fits many vehicles, among them the 1999-2016 Ford F-450 Super Duty, 1999-2016 Ford F-550 Super Duty and 2003 Ford E-550 Super Duty. See the "Vehicles it fits" section for the full list.
A leaf helper spring works alongside the main rear leaf spring to add support as the vehicle takes on weight. If the original helper spring is cracked, broken or weakened by rust, this rear-position spring is intended to replace it.
- Direct replacement: engineered to line up with the original spring's fit and function on the listed applications.
- Replacement for a failed part: a dependable option when rust and fatigue have taken the factory helper spring out of service.
- Durable construction: made from quality materials and engineered for durability and reliable performance.
- Trustworthy quality: backed by Dorman's team of product experts in the United States and more than a century of automotive experience.
A rear end that sags or sits low under load, bottoming out over bumps, or leaves that are visibly cracked, broken or heavily rusted may be signs this part needs replacing. Inspect the whole spring assembly to confirm the cause before ordering.
Interchange: 043-1749-00HD
043174900HD
Frequently Asked Questions
What does a leaf helper spring do?
It works with the main rear leaf spring to add support as the vehicle carries weight. Dorman 43-1749HD is a direct replacement for a helper spring that has failed.
Which trucks does Dorman 43-1749HD fit?
It fits many vehicles, including the 1999-2016 Ford F-450 Super Duty, 1999-2016 Ford F-550 Super Duty and 2003 Ford E-550 Super Duty. Check the "Vehicles it fits" section for your application.
Is this a front or rear spring?
It is cataloged for the rear position on the listed applications.
What are signs a helper spring may need replacing?
A rear that sags or sits low under load, bottoming out over bumps, or cracked, broken or heavily rusted leaves can be signs. Inspect the full spring assembly to confirm the cause.
What should I know before installing it?
Leaf spring work requires safely supporting the vehicle's weight. Follow the vehicle service information for the procedure, fasteners and torque specs, and consult a professional if unsure.
