KYB SRG4131 Suspension Strut and Coil Spring Assembly - Front Left

KYB Truck-Plus Front Left Strut Assembly

The KYB Truck-Plus Performance Assembly SRG4131 is a front left suspension strut and coil spring assembly built for Toyota trucks and SUVs that need precise ride control. It combines a KYB Gas-a-Just monotube shock with exact-fit, side-specific components for a direct replacement on select 2003-2009 Toyota 4Runner and 2007-2009 Toyota FJ Cruiser applications.

Key Features

• Complete KYB Gas-a-Just strut assembly from an OEM-quality shock and strut brand
• Up to 25% more damping performance than standard shock absorbers on Toyota applications
• Heavy-duty monotube design for added handling response and control
• Built for trucks that work, tow, haul, or see off-road use
• Assembled in the USA
• Exact-fit, pre-assembled design for professional results
• Left and right side-specific engineering to match the vehicle manufacturer’s layout
• Engineered to help vehicles with electronic safety systems such as ESC and ABS

Product Details

KYB Truck-Plus Performance Assembly SRG4131 is part of the Truck-Plus Performance Assembly line, a KYB product line focused on truck and SUV suspension replacement with a performance-oriented setup. This assembly uses a Gas-a-Just monotube shock absorber to deliver firmer damping response than a standard replacement unit, helping maintain ride height, steering precision, and stability under load. It is a direct-fit front left assembly for 2003-2009 Toyota 4Runner and 2007-2009 Toyota FJ Cruiser models, excluding X-Reas and adjustable suspension systems on the 4Runner.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Issues This Assembly Can Address

• Excessive front-end bounce after hitting bumps or dips
• Reduced steering response or loose-feeling front suspension
• Front suspension sag or inconsistent ride height under load
• Body roll and instability during towing, hauling, or off-road driving
• Wear-related noise or degraded damping from an aging strut assembly

Installation Notes

Fits 2003-2009 Toyota 4Runner, front left, Gas-a-just, monotube performance upgrade; except X-Reas and adjustable suspensions; Truck-Plus Performance Assembly. Fits 2007-2009 Toyota FJ Cruiser, front left, Gas-a-just, monotube performance upgrade; Truck-Plus Performance Assembly. Verify side, position, and suspension configuration before installation. Because this is a pre-assembled strut and coil spring unit, it is intended to reduce assembly time compared with building the strut from separate components.

Quality Assurance

KYB designs Truck-Plus assemblies with exact fitment and side-specific components to match the original suspension layout. The SRG4131 is assembled in the USA and built around KYB’s Gas-a-Just monotube technology for consistent damping performance in truck and SUV service.