KYB 5640004 Suspension Strut - Front

KYB MonoMax Front Strut for Ford F-150

The KYB MonoMax 5640004 is a heavy-duty front suspension strut built for 2009-2013 Ford F-150 trucks with a leveling setup and without Heavy Duty or Sport Suspension. It is part of KYB’s MonoMax line, which focuses on added control and durability for trucks that tow, haul, or see rougher road conditions.

Key Features

• Fits 2009-2013 Ford F-150, front
• MonoMax heavy-duty monotube design for stable damping response
• Large-bore construction for truck use and higher load demands
• Fade-resistant performance under changing road and load conditions
• Zinc-coated steel piston ring for work-oriented durability
• Off-road dust boot included for added protection in harsh environments
• Compressed length: 18.22 in; extended length: 22.48 in; stroke length: 4.26 in
• Lower mount type: E2(20x60); upper mount type: S1(12MM)

Detailed Description

KYB MonoMax 5640004 is engineered for the front suspension of the Ford F-150 when the truck needs firmer control and consistent response from a monotube strut. The MonoMax line is built around truck-duty performance, with a design that automatically adjusts to driving conditions to help maintain control during towing, hauling, and off-road use. For 2009-2013 Ford F-150 owners searching for a front leveling strut, this part number provides a direct fit for the listed application.

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

Common Problems It Can Help Address

• Excessive front-end bounce over uneven pavement
• Reduced control when towing or carrying heavy loads
• Front suspension fade during extended rough-road driving
• Loose or unsettled ride feel on a leveled Ford F-150
• Need for a front strut replacement on 2009-2013 Ford F-150 trucks

Installation Notes and Tips

Verify the vehicle uses the listed front leveling strut application and confirm the mount types before installation. This KYB 5640004 strut is specified for 2009-2013 Ford F-150 models without Heavy Duty and Sport Suspension. Always inspect related suspension components, alignment settings, and mounting points during replacement to ensure proper ride height and handling.

Quality Assurance

KYB is a long-established suspension manufacturer known for OE-level engineering and truck-focused damping technology. The MonoMax line uses a monotube design, a zinc-coated steel piston ring, and an off-road dust boot to support durability in demanding service.