KYB 5640017 MonoMax Heavy-Duty Monotube Gas Strut

The KYB MonoMax 5640017 is a heavy-duty monotube gas strut engineered for trucks, SUVs, and 4x4s that face demanding real-world conditions. With a large-bore monotube design, the MonoMax delivers significantly more damping force than standard OE-style twin-tube struts, providing superior stability and control — especially for vehicles with a higher center of gravity, larger aftermarket wheels, or added payload.

Key Features:

• Heavy-duty monotube construction — outperforms conventional twin-tube shock absorbers for maximum handling and durability
• Large bore design — provides additional stability for heavier, more powerful, or high center-of-gravity vehicles
• Fade-free performance — automatically adjusts to changing driving conditions without sacrificing control
• Zinc-coated steel piston ring — maintains a positive seal under extreme on- and off-road conditions
• Includes off-road dust boot — protects the strut shaft from dirt, debris, and moisture to extend service life
• Tow and haul ready — ideal for towing trailers, hauling heavy loads, plowing, and off-road use
• Lifetime limited warranty — backed by KYB's manufacturer warranty for the original retail purchaser for the life of vehicle ownership

KYB is a globally recognized OE supplier to vehicle manufacturers, and the MonoMax is built using the same materials and manufacturing standards as original equipment components. The KYB 5640017 is sold as a single strut unit. All necessary washers, bushings, and nuts are included for installation; factory shock mounting bolts are reused. Strut boots are sold separately.