Dorman 43-1579 rear leaf helper spring for the 2005-2007 Ford F-350 Super Duty adds support to the rear leaf springs when the truck is loaded.
A rear end that sags under load, bottoms out over bumps, or shows a rusted or cracked spring can mean the helper spring has worn out. Before you replace it, rule out a cracked main leaf, worn shocks or worn bushings as the source of the sag. Plan to replace the left and right helper springs together; this listing is one spring.
This is a direct replacement for the 2005-2007 Ford F-350 Super Duty.
Fit and size
Build and materials
One leaf helper spring. This listing holds one spring, and the 2005-2007 Ford F-350 Super Duty takes two. Mounting hardware is not included, so plan on new hardware rather than reusing the old.
Interchange: 43-1595 · 43-1725 · 43-1579DAY
5C345588DA · 5C34DA · 5C3Z5588DA
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This part cross-references / interchanges with the following part numbers:
Is the Dorman 43-1579 rear leaf helper spring right for the 2005-2007 Ford F-350 Super Duty?
Yes. Dorman 43-1579 is a direct replacement rear leaf helper spring for the 2005-2007 Ford F-350 Super Duty.
Does the Dorman 43-1579 come with mounting bolts?
No. It comes as one leaf helper spring without mounting hardware, so plan on buying new hardware.
How much load is this leaf helper spring rated for?
Dorman 43-1579 has a maximum load rating of 450 pounds and a load increase strength of 450 pounds.
How can I tell if a rear helper spring is worn out?
Notice whether the rear sags under load or bottoms out over bumps. A shop can inspect the spring for rust or cracks and confirm the cause.
What are the size and material of this helper spring?
This leaf helper spring is steel, 41.625 inches long, 3 inches wide and 0.473 inch thick.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
