Dorman 43-1577 rear leaf helper spring for the 2005-2007 Ford F-250 Super Duty and other vehicles adds supporting force to the rear suspension. It works alongside the main leaf springs to help carry load at the rear axle.
- Steel construction for durability under load
- Leaf spring load increase strength of 550 pounds
- Replaces an original spring that has failed from rust and fatigue
- Part of the Dorman OE Solutions line
Quick facts
- Part: Dorman 43-1577 leaf helper spring
- Fits: 2005-2007 Ford F-250 Super Duty and other vehicles
- Position: Rear
- Material: Steel
- Condition: New
A rear end that sags under load, or a cracked, rusted or flattened spring, can mean this helper spring is worn, though a tired rear shock or a weak main leaf spring can also be behind them. Plan to change both rear helper springs together; this listing is one spring, and the 2005-2007 Ford F-250 Super Duty takes two.
Fits
It is a direct-fit replacement for the 2005-2007 Ford F-250 Super Duty and the 2005-2007 Ford F-350 Super Duty.
Specifications
Fit and size
- Position: Rear
- Quantity per vehicle: 2
- Length: 41.625 in
- Width: 3 in
- Thickness: 0.527 in
Build and materials
- Material: Steel
- Maximum load rating: 550 lb
- Condition: New
In the box
One leaf helper spring. Mounting hardware is not included, so plan on new hardware.
Interchange: 43-1521 · 43-1731 · 43-1577DAY · 043-1577-00
5C345588CA · 5C34CA · 5C3Z5588CA
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
43-1521, 43-1731, 5C345588CA, 5C34CA, 5C3Z5588CA, 43-1577DAY, 043-1577-00
Frequently Asked Questions
Is the Dorman 43-1577 rear leaf helper spring right for a 2005-2007 Ford F-350 Super Duty?
Yes. Dorman 43-1577 is a rear leaf helper spring for the 2005-2007 Ford F-350 Super Duty, and the 2005-2007 Ford F-250 Super Duty takes it as well.
Do I need to buy bolts separately for the Dorman 43-1577?
Yes. Dorman 43-1577 is one leaf helper spring and mounting hardware is not included, so plan on new hardware.
How much load is this steel helper spring rated for?
The maximum load rating is 550 pounds, and the leaf spring load increase strength is also 550 pounds.
What does a failed rear helper spring look like?
A rear end that sags under load can mean the helper spring has failed. A shop can inspect the spring for cracks, heavy rust or a flattened shape.
What are the dimensions of the Dorman 43-1577 leaf helper spring?
Dorman 43-1577 measures 41.625 inches long, 3 inches wide and 0.527 inch thick.
