KYB SR4158 Suspension Strut and Coil Spring Assembly - Rear

KYB Strut-Plus SR4158 Rear Suspension Assembly

KYB Strut-Plus SR4158 is a rear suspension strut and coil spring assembly engineered for 2003-2006 Ford Expedition models without air suspension. It combines OE-style ride height restoration with application-specific damping to help bring back stable handling and predictable control.

Built around KYB’s Excel-G strut and a high-carbon steel coil spring, this assembly is designed for direct replacement service on the rear of the Ford Expedition. It is assembled in the USA and pre-built for professional installation on vehicles with electronic safety systems such as ESC and ABS.

Key Features

• Complete rear strut and coil spring assembly for OE-style replacement
• Includes a KYB Excel-G strut with precision-designed damping valves
• High-carbon steel coil spring helps restore ride height to OE specifications
• Stronger steel outer shell for added assembly strength
• Engineered for vehicles equipped with ESC, ABS, and related electronic safety systems
• Exact-fit, pre-assembled design for professional results
• Assembled in the USA

Product Details

KYB Strut-Plus SR4158 is part of KYB’s Strut-Plus line, a complete suspension solution built to restore the original ride and handling characteristics of the vehicle. KYB uses OE-focused engineering to match vehicle attributes and corner weights, helping the rear suspension maintain proper stance and control. For 2003-2006 Ford Expedition rear applications, this assembly provides a direct replacement path for worn struts and fatigued springs while preserving factory ride height targets.

This part cross-references Monroe Shocks & Struts (e.g., 171370, 181370) for the same application.

Common Problems This Part Can Address

• Rear-end sagging or uneven ride height
• Excessive bouncing after bumps or dips
• Reduced stability during braking, cornering, or lane changes
• Worn strut performance that affects steering response and body control
• Suspension noise or degraded ride quality from aging rear components

Installation Notes and Tips

Fits 2003-2006 Ford Expedition, rear, excluding air suspension. Verify the vehicle’s suspension configuration before ordering, and compare the original assembly to the new unit before installation. Because this is a pre-assembled strut and spring unit, it is intended to streamline replacement and reduce the need to transfer spring components during service.

Quality Assurance

KYB is an original equipment supplier, and the Strut-Plus line is engineered to restore handling, control, and ride height using OE-based design targets. SR4158 is assembled in the USA and built with application-specific damping and spring specifications for the listed Ford Expedition rear fitment.