KYB 5640020 Suspension Strut - Front

Heavy-Duty Front Suspension Strut

The KYB MonoMax suspension strut is built for demanding truck and EV applications that need added stability, control, and durability. This KYB MonoMax 5640020 is a heavy-duty monotube design with fade-resistant performance and work-ready construction.

• Heavy-duty monotube suspension strut for demanding use
• Large-bore design for added stability and control
• Fade-free performance under changing driving conditions
• Zinc-coated steel piston ring for durability
• Includes an off-road dust boot

Fitment and Application

Fits 2022-2025 Ford F-150 Lightning, front. This application is listed as a new part number and is noted for the MonoMax product line. The KYB MonoMax 5640020 is intended for vehicles that tow, haul, or see off-road use, where consistent damping and stronger control are important. This part cross-references Ford NL3Z18124A and NL3Z18124B for the same application.

What It Helps Address

• Excess body movement during towing or hauling
• Reduced control on rough or uneven roads
• Shock fade during repeated suspension loading
• Premature wear from demanding driving conditions

Installation Notes and Tips

Verify the upper and lower mount types before installation: upper mount S1 (12 mm) and lower mount E3 (88.75 x 117 x 13). Confirm compressed length, extended length, and stroke length against the vehicle’s suspension requirements before service. Use the listed front fitment only for the specified application.

Quality Assurance

KYB positions the MonoMax line for heavy-duty truck use, with a monotube construction and work-ready materials chosen for durability and consistent performance.