KYB 565121 Shock Absorber - Front

KYB MonoMax Front Shock for Ford Super Duty

The KYB MonoMax 565121 is a heavy-duty front shock absorber built for Ford Super Duty trucks that work hard, tow, haul, and see rough roads. Its monotube design is tuned for added control and stability on higher center-of-gravity trucks, including Ford F-250 Super Duty and Ford F-350 Super Duty applications.

KYB’s MonoMax line focuses on suspension performance for trucks that need firmer damping, consistent response, and durability under load. The 565121 uses a zinc-coated steel piston ring for sealing in demanding conditions and includes an off-road dust boot to help protect the shaft and seals from debris.

Key Features

• Heavy-duty monotube shock absorber for front suspension use
• Up to 40% more damping performance than standard shock absorbers
• Truck-focused design for towing, hauling, and off-road driving
• Zinc-coated, stainless steel piston ring for a positive seal in extreme conditions
• Rubber boot helps keep dirt and debris away from the seals
• Engineered to work with vehicles equipped with electronic safety systems such as ESC and ABS
• Compressed length: 13.38 in.; extended length: 20.7 in.; stroke length: 7.32 in.
• Lower mount type: E2(14.6X42); upper mount type: S1(12MM)

Detailed Description

The KYB MonoMax 565121 is a front suspension shock absorber for Ford Super Duty trucks that need more controlled damping than a standard replacement shock. This part number is a strong fit for drivers searching for a Ford F-250 Super Duty front shock or Ford F-350 Super Duty front shock with a monotube upgrade. It is also a practical choice for trucks used in demanding conditions where load control and consistent handling matter.

As part of the KYB MonoMax line, this shock is built around a large-bore monotube layout that responds quickly to changing road and load conditions. The design supports stable handling on heavy-duty pickups, including Ford F-250 Super Duty and Ford F-350 Super Duty models, while helping maintain predictable ride control during towing, hauling, and off-road use. Part number 565121 is also cross-referenced with Monroe Shocks & Struts 911266 for the same application.

What This Shock Helps Address

• Excessive front-end bounce on loaded Ford Super Duty trucks
• Reduced control when towing a trailer or carrying heavy cargo
• Front suspension fade during repeated rough-road use
• Need for a monotube upgrade over a standard shock absorber
• Dust and debris exposure around the shock shaft and seals

Installation Notes and Tips

Confirm front-position fitment before ordering. This KYB 565121 shock fits 2023-2025 Ford F-350 Super Duty, front, w/o Tremor Package; 2022-2024 Ford F-250 Super Duty, front, w/o Off Road Suspension; 2021-2022 Ford F-350 Super Duty, front, w/ Dual Rear Wheels; 2005-2021 Ford F-250 Super Duty, front; 2005-2020 Ford F-350 Super Duty, front; 2017-2019 Ford F-350 Super Duty, front, w/ Dual Rear Wheels; and 2011-2017 Ford F-250 Super Duty, front, w/ Off Road Suspension.

Verify mount style and suspension configuration against the vehicle before installation. The listed dimensions and mount types should be matched to the original shock location to ensure proper fit and travel.

Quality Assurance

KYB builds the MonoMax line for heavy-duty truck use with a monotube construction intended to deliver consistent damping and durable sealing performance. The zinc-coated piston ring and protective dust boot support long-term service in demanding front suspension applications.