KYB SR4006 Suspension Strut and Coil Spring Assembly - Front Left

KYB Strut-Plus SR4006 Overview

The KYB Strut-Plus SR4006 is a complete front left suspension strut and coil spring assembly for select Ford, Mercury, and Mazda applications. Built to restore OE ride height and handling, it combines a KYB Excel-G strut with a vehicle-specific spring and side-specific components for a direct replacement on the front left corner.

Compatible with 1991-1996 Ford Escort front left, 1991-1996 Mercury Tracer front left, 1990-1994 Mazda 323 front left, and 1990-1994 Mazda Protege front left, this assembly is engineered for precise fitment and consistent suspension response.

Key Features

• Complete strut assembly with KYB Excel-G strut and coil spring
• High-carbon steel spring designed around vehicle weight and corner loads
• Stronger steel outer shell with application-specific damping valves
• Pre-assembled for professional installation and exact fitment
• Side-specific design for the front left position
• Engineered to support vehicles equipped with electronic safety systems such as ESC and ABS
• Assembled in the USA

Product Line Details

KYB Strut-Plus is a complete suspension strut and coil spring assembly line built around OE-style replacement requirements. The SR4006 uses KYB’s Excel-G strut platform and a matched spring package to help restore ride height, steering response, and suspension control on the front left side.

Detailed Description

The KYB SR4006 is designed as an OE-restoring replacement for vehicles that need a complete front left strut assembly rather than individual suspension components. KYB uses its experience as an original equipment supplier to match damping, spring rate, and ride height to the vehicle’s original specifications. This makes the SR4006 a practical choice for restoring stable handling, steering feel, and suspension geometry on the Ford Escort, Mercury Tracer, Mazda 323, and Mazda Protege.

This part cross-references Monroe Shocks & Struts 171878 for the same application.

What It Helps Address

• Front-end sag or reduced ride height
• Loose, unstable, or uneven handling
• Worn strut performance causing excessive bounce
• Steering response changes from aging suspension components
• Suspension wear that can affect ESC and ABS system behavior

Installation Notes and Tips

Install the SR4006 on the front left position only. Because it is pre-assembled and side-specific, verify vehicle year, make, model, and suspension configuration before installation. Mazda 323 applications exclude electronic adjustable suspension. After installation, inspect alignment and confirm ride height and steering wheel centering.

Quality Assurance

KYB is an original equipment supplier, and the Strut-Plus line is engineered to restore factory-style handling and control. The SR4006 is assembled in the USA and built with OE-focused components for consistent replacement quality.