Dorman 43-1581 rear leaf helper spring for the 2005-2016 Ford F-350 Super Duty adds support for extra load at the rear suspension. It is a direct replacement for a helper spring that has failed from rust and fatigue.
- Steel leaf spring
- Adds 600 lb of load increase strength, with a maximum load rating of 600 lb
- Part of the Dorman OE Solutions line
- Sold as one leaf spring
Quick facts
- Part: Dorman 43-1581 leaf helper spring
- Fits: 2005-2016 Ford F-350 Super Duty
- Position: Rear
- Material: Steel
- Condition: New
A rear end that sags under load, a cracked leaf or heavy rust can mean the helper spring has worn out. Before you replace this spring, rule out worn shocks and a tired main leaf pack, since a low rear stance has more than one possible source.
Fits
This spring fits the 2005-2016 Ford F-350 Super Duty, which takes two. Plan to replace the pair together; this listing is one spring.
Specifications
Fit and size
- Position: Rear
- Quantity per vehicle: 2
- Length: 43.25 in
- Width: 3 in
- Thickness: 0.558 in
Build and materials
- Type: Leaf helper spring
- Material: Steel
- Maximum load rating: 600 lb
- Load increase strength: 600 lb
- Condition: New
In the box
One leaf spring. Mounting hardware is not included, so plan on new hardware, as the old pieces may not be reusable.
Interchange: 43-1527 · 43-1601 · 43-1701 · 43.1881 · 43-1939
5C345588GB · 5C34GB · 5C3Z5588GA
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
43-1527, 43-1601, 43-1701, 43.1881, 43-1939, 5C345588GB, 5C34GB, 5C3Z5588GA
Frequently Asked Questions
Does the Dorman 43-1581 rear leaf helper spring fit the 2005-2016 Ford F-350 Super Duty?
Yes. Dorman 43-1581 is a rear leaf helper spring listed for the 2005-2016 Ford F-350 Super Duty, which takes two. This listing is one spring.
Do I need new bolts for this Dorman rear leaf helper spring?
Dorman 43-1581 comes as one leaf spring with no mounting hardware. Plan on new hardware, because the old pieces may not be reusable.
How much load is this rear helper spring rated for?
This helper spring has a maximum load rating of 600 pounds and adds 600 pounds of load increase strength. It measures 43.25 in long, 3 in wide and 0.558 in thick.
How can I tell if my rear leaf helper spring has rusted or fatigued?
A visible crack, heavy rust or a rear end that sags under load can mean the spring has worn out. These can be seen with the vehicle parked, and a shop can inspect it if you are unsure.
Does Dorman 43-1581 replace the 43-1601 helper spring?
Yes, 43-1601 is one of the numbers this spring replaces, along with 43-1527, 43-1701, 43-1939 and 5C3Z5588GA.
