KYB 565124 Shock Absorber - Rear

KYB MonoMax Rear Shock for Ford Super Duty

The KYB MonoMax 565124 is a heavy-duty rear shock absorber built for Ford Super Duty trucks that work hard on-road and off-road. It is a fitment-based upgrade for 2005-2016 Ford F-250 Super Duty and 2008-2016 Ford F-350 Super Duty rear applications, with a monotube design that supports stable handling under load.

Key Features

• Monotube shock design for consistent damping and control
• Up to 40% more damping performance than standard shock absorbers
• Zinc-coated stainless steel piston ring for a positive seal in demanding conditions
• Rubber dust boot helps protect the shaft and seal area from dirt and debris
• Engineered to work with vehicles equipped with electronic safety systems such as ESC and ABS
• Compressed length: 17.87 in; extended length: 29.05 in; stroke length: 11.18 in
• Lower mount type: E2 (12x38); upper mount type: E1

Product Details

KYB MonoMax is the brand’s truck-focused shock line, built for heavier, higher-center-of-gravity vehicles that need added stability and control. The KYB 565124 uses a large-bore monotube construction to maintain fade-resistant performance during towing, hauling, and off-road use. For Ford F-250 Super Duty and Ford F-350 Super Duty rear suspension service, this shock is a direct-fit option for drivers looking to restore or upgrade damping response without changing the vehicle’s suspension layout.

This part cross-references Ford OE numbers such as 5C3Z18125A and BC3Z18125AE for the same application.

Common Problems This Shock Can Address

• Excessive rear-end bounce after bumps or dips
• Reduced control when towing a trailer or carrying heavy cargo
• Harsh or inconsistent damping from worn factory shocks
• Loss of stability on rough roads, job sites, or off-road terrain
• Seal wear caused by dirt, debris, and repeated suspension movement

Installation Notes and Tips

Verify rear fitment by year, model, and suspension notes before installation. This shock is listed for 2011-2016 Ford F-250 Super Duty, rear, with Off Road Suspension; 2005-2016 Ford F-250 Super Duty, rear, upgrade to monotube shock absorbers for improved performance; and 2008-2016 Ford F-350 Super Duty, rear, without Off Road Suspension. Confirm mount style and compressed/extended length against the original shock before final assembly. Professional installation and a post-installation inspection of ride height, fasteners, and suspension travel are recommended.

Quality Assurance

KYB manufactures the MonoMax line as a heavy-duty suspension shock absorber for truck applications, with materials and construction chosen for durability in demanding service. The zinc-coated piston ring and protective dust boot support long-term sealing and contamination resistance in real-world use.