KYB SR4171 Suspension Strut and Coil Spring Assembly - Front

KYB Strut-Plus Front Strut Assembly

The KYB Strut-Plus SR4171 is a front suspension strut and coil spring assembly engineered to restore ride height, handling, and steering response. Built for 2009-2013 Ford F-150 applications, it is a direct-fit OE-style replacement for trucks that need front-end control brought back to specification.

As part of KYB’s Strut-Plus line, this assembly combines an OE-restoring KYB Excel-G strut with a high-carbon steel coil spring and a stronger steel outer shell. The result is a pre-assembled front strut solution for the Ford F-150 that supports proper vehicle stability and helps maintain performance for systems such as ESC and ABS.

• Part number SR4171 for front suspension service
• Includes a KYB Excel-G strut with application-specific damping valves
• High-carbon steel coil spring helps restore OE ride height
• Stronger steel outer shell adds structural support
• Exact-fit, pre-assembled design for professional installation
• Engineered for vehicles with electronic safety systems such as ESC and ABS
• Assembled in the USA

Strut-Plus Product Line Details

KYB Strut-Plus assemblies are built as complete front suspension units for drivers and technicians who want an OE-style replacement without rebuilding the strut assembly from individual components. The SR4171 follows that approach with matched damping and spring rate selection based on vehicle attributes and corner weights, helping the Ford F-150 return to its intended stance and road feel. This part number SR4171 is a direct replacement choice for front suspension repair on the Ford F-150.

Common Problems This Assembly Addresses

• Front-end sag or ride height that has dropped below OE specification
• Excessive bounce, body motion, or reduced damping control
• Loose or inconsistent steering feel from worn strut components
• Noise or instability caused by aging front suspension parts
• Loss of suspension control that can affect ESC and ABS performance

Installation Notes and Fitment

Fits 2009-2013 Ford F-150, front, recommended OE replacement; w/o Heavy Duty Suspension; Strut-Plus. Fits 2010 Ford F-150, front, recommended OE replacement; w/ Standard Package or w/ Off Road Package; Strut-Plus. Fits 2009-2010 Ford F-150, front, recommended OE replacement; w/o 8 foot Bed, w/o Heavy Duty Suspension; Strut-Plus. This part cross-references Monroe Shocks & Struts (e.g., 171141, 181141) for the same application.

Before installation, verify the truck’s suspension package and front application details against the listed fitment notes. Because this is a pre-assembled strut and spring unit, it is intended to streamline replacement of the front suspension assembly on the specified Ford F-150 models. Professional installation and a final alignment are recommended after replacement.

Quality Assurance

KYB is an original equipment supplier, and the Strut-Plus SR4171 is engineered to restore handling and control characteristics using OE-focused design inputs. The assembly is built with application-specific damping and spring specifications to help return the vehicle to proper ride height and front suspension performance.