KYB SR4515 Suspension Strut and Coil Spring Assembly - Rear

KYB Strut-Plus Rear Strut Assembly SR4515

KYB SR4515 is a rear suspension strut and coil spring assembly built for Ford Expedition and Lincoln Navigator applications that need OE-style ride height and handling restoration. This KYB Strut-Plus assembly combines a KYB Excel-G strut with a high carbon steel coil spring to help return the vehicle to factory ride characteristics.

Key Features

• Complete rear strut assembly for direct replacement service
• Includes a KYB Excel-G strut, stronger steel outer shell, and application-specific precision damping valves
• High carbon steel coil spring is developed around vehicle attributes and corner weights to restore ride height within OE specifications
• Exact fitment, pre-assembled for professional results
• Engineered to support vehicles equipped with electronic safety systems such as ESC and ABS
• Assembled in the USA

Product Details

The KYB Strut-Plus line is built as a complete suspension strut and coil spring assembly for drivers who want a direct OE-style replacement without rebuilding the unit piece by piece. For rear suspension service on the Ford Expedition and Lincoln Navigator, SR4515 is engineered to restore control, stability, and ride height using KYB’s OE-restoring strut design and a spring matched to the application. This part cross-references Monroe Shocks & Struts (e.g., 171139, 181139) for the same application. KYB SR4515 is a practical choice for rear suspension repair when the original assembly has lost damping performance or the vehicle sits lower than intended.

What It Helps Fix

• Rear-end sag or reduced ride height
• Excessive bouncing after bumps
• Loose or unstable rear suspension feel
• Uneven ride quality from worn strut components
• Loss of factory handling response on Ford Expedition and Lincoln Navigator models

Installation Notes

Fits 2018-2021 Ford Expedition, rear, except Electronic Controlled Suspension and without Load Leveling Suspension, without Off Road Suspension; Strut-Plus. Fits 2014-2017 Ford Expedition, rear, recommended OEM replacement; except Electronic and Load Leveling Suspension; Strut-Plus. Fits 2015-2017 Lincoln Navigator, rear, recommended OEM replacement; except Electronic and Load Leveling Suspension; Strut-Plus. Fits 2007-2014 Lincoln Navigator, rear, recommended OEM replacement; except Self Leveling Suspension; Strut-Plus. Fits 2007-2013 Ford Expedition, rear, recommended OEM replacement; except adjustable suspension; Strut-Plus. Verify suspension options before ordering, since excluded systems vary by year and model.

Quality Assurance

KYB is an original equipment supplier, and the Strut-Plus design reflects OE-based engineering for ride control, steering response, and suspension stability. SR4515 is assembled in the USA and built to match the application-specific requirements of the listed Ford Expedition and Lincoln Navigator rear suspension setups.