Dorman 43-1577 Leaf Helper Spring - Rear
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Dorman

Dorman 43-1577 Leaf Helper Spring - Rear

Brand Dorman 43-1577
Position Rear
Material Acero
Material Steel
Length 41.625
Color Black
Color Negro
Color Noir
Thickness 0.527
Leaf Spring Load Increase Strength 550
Maximum Load Rating 550
Width 3
Mounting Hardware Included No
Mounting Hardware Included Non
Contenidos del paquete 1 hoja de muelle
Package Contents 1 leaf spring
Fits Ford · 12 vehicles

OE-style fit. Matches the original spring's function for straightforward replacement.

Steel construction. Built for durability and reliable performance.

Load support. Adds up to 550 of spring load increase strength.

Cross-references 5C3Z5588CA, 5C34CA and 5C345588CA for the same application. See all 7.

$106.16Free shipping
In stock · usually ships same day before 1pm CST
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Order total $106.16
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Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Leaf Helper Spring options

Dorman 43-1577 Leaf Helper Spring

Dorman 43-1577 is a rear leaf helper spring engineered to match the fit and function of the original spring on specified vehicles. Built from steel with a black finish, it is made for dependable load support on 2005-2007 Ford F-250 Super Duty and 2005-2007 Ford F-350 Super Duty applications.

Key Features

  • Direct-fit leaf helper spring for rear suspension service
  • Steel construction for durability and consistent performance
  • Black finish for a clean, corrosion-resistant appearance
  • 550 lb. load increase strength
  • Designed for 2005-2007 Ford F-250 Super Duty and Ford F-350 Super Duty rear applications
  • Part number 43-1577 for easy identification and ordering

Detailed Description

This Dorman leaf helper spring is built to restore rear suspension support where the original spring has weakened or lost capacity. It measures 41.625 inches long, 3 inches wide, and 0.527 inches thick, with a 550 lb. maximum load rating. The design follows the original fit and function for the specified Ford Super Duty rear suspension setup, including 2005-2007 Ford F-250 Super Duty and 2005-2007 Ford F-350 Super Duty with single rear wheel (SRW) configuration.

For buyers searching for a rear leaf helper spring for 2005-2007 Ford F-250 Super Duty or a replacement leaf spring for 2005-2007 Ford F-350 Super Duty, Dorman 43-1577 provides a direct OE-style solution. This part cross-references 5C3Z5588CA and 43-1521 for the same application.

Common Problems This Part Can Address

  • Sagging rear ride height from a worn helper spring
  • Reduced rear suspension support under load
  • Uneven rear stance after spring fatigue
  • Loss of original spring rate in heavy-duty use
  • Noisy or inconsistent rear suspension response from a damaged spring

Installation Notes and Tips

Verify rear suspension configuration before ordering, especially on Ford F-350 Super Duty SRW models. Compare the original spring length, width, thickness, and mounting points to confirm match before installation. Mounting hardware is not included, so reuse or source the required hardware separately if needed. After installation, inspect ride height and suspension alignment to confirm proper seating.

Quality Assurance

Dorman designs this leaf helper spring to match the original spring’s fit and function on the listed vehicles, with steel construction selected for durable, reliable service. Part number 43-1577 is intended for direct replacement use on the specified Ford Super Duty rear suspension applications.

This part fits 12 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelBody TypePositionNotes
2007FordF-250 Super Duty—Rear1 Leaf; Full Taper; 1/2 In. Leaf Thickness; 550 Lb. Average Capacity
2007FordF-350 Super DutyStandard Cab PickupRear1 Leaf; Full Taper; 1/2 In. Leaf Thickness; 550 Lb. Average Capacity; w/Single Rear Wheel (SRW)
2007FordF-350 Super DutyExtended Cab PickupRear1 Leaf; Full Taper; 1/2 In. Leaf Thickness; 550 Lb. Average Capacity; w/Single Rear Wheel (SRW)
2007FordF-350 Super DutyCrew Cab PickupRear1 Leaf; Full Taper; 1/2 In. Leaf Thickness; 550 Lb. Average Capacity; w/Single Rear Wheel (SRW)
2006FordF-250 Super Duty—Rear1 Leaf; Full Taper; 1/2 In. Leaf Thickness; 550 Lb. Average Capacity
2006FordF-350 Super DutyStandard Cab PickupRear1 Leaf; Full Taper; 1/2 In. Leaf Thickness; 550 Lb. Average Capacity; w/Single Rear Wheel (SRW)
2006FordF-350 Super DutyExtended Cab PickupRear1 Leaf; Full Taper; 1/2 In. Leaf Thickness; 550 Lb. Average Capacity; w/Single Rear Wheel (SRW)
2006FordF-350 Super DutyCrew Cab PickupRear1 Leaf; Full Taper; 1/2 In. Leaf Thickness; 550 Lb. Average Capacity; w/Single Rear Wheel (SRW)
2005FordF-250 Super Duty—Rear1 Leaf; Full Taper; 1/2 In. Leaf Thickness; 550 Lb. Average Capacity
2005FordF-350 Super DutyStandard Cab PickupRear1 Leaf; Full Taper; 1/2 In. Leaf Thickness; 550 Lb. Average Capacity; w/Single Rear Wheel (SRW)
2005FordF-350 Super DutyExtended Cab PickupRear1 Leaf; Full Taper; 1/2 In. Leaf Thickness; 550 Lb. Average Capacity; w/Single Rear Wheel (SRW)
2005FordF-350 Super DutyCrew Cab PickupRear1 Leaf; Full Taper; 1/2 In. Leaf Thickness; 550 Lb. Average Capacity; w/Single Rear Wheel (SRW)
Directly replaces or cross-references 7 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
5C3Z5588CA5C34CA5C345588CA43-1521043-1577-0043-1577DAY43-1731