KYB 5640020 MonoMax Heavy-Duty Monotube Gas Strut for Trucks & SUVs

The KYB 5640020 MonoMax is a heavy-duty monotube gas-charged strut engineered specifically for trucks, SUVs, and Jeeps that demand maximum control under the most challenging conditions. Unlike standard twin-tube shocks, the MonoMax's large-bore monotube design delivers greater damping force and more consistent fade-free performance — whether on the highway, off-road, or under a heavy load.

Key Features:

• Heavy-Duty Monotube Design: Single-tube construction provides superior damping performance and heat dissipation compared to conventional twin-tube shocks
• Large-Bore Construction: Delivers the additional stability that heavier, more powerful, or high-center-of-gravity vehicles require
• Zinc-Coated Steel Piston Ring: Ensures a reliable, long-lasting seal in all operating conditions
• Ultra-Smooth Triple Chrome-Plated Piston Rod: Reduces seal wear and extends service life
• Multi-Lip Synthetic Oil Seal: Engineered to keep fluid in and contaminants out
• Off-Road Dust Boot Included: Thick rubber boot protects the shaft from dirt, debris, and road grime
• Adaptive Valving: Automatically adjusts damping response to changing driving conditions for consistent, fade-free handling
• Lifetime Limited Warranty: KYB's manufacturer warranty covers defects for as long as the original purchaser owns the vehicle

The KYB MonoMax excels in the most demanding real-world applications, including towing, hauling heavy payloads, snow plowing, and off-road driving. It is also an ideal upgrade for vehicles running larger, heavier aftermarket wheel and tire packages, where factory OE shocks are not calibrated to handle the additional unsprung weight. Necessary mounting hardware — including washers, bushings, and nuts — is included. Note: Shock boots are sold separately.

KYB is a globally recognized Original Equipment supplier, producing aftermarket suspension components to the same standards and in the same facilities used for OEM production. The MonoMax line represents KYB's highest-performance shock offering for truck and SUV applications.