Monroe 550055 Shock Absorber - Rear

Monroe Magnum Severe Service Shock Absorber

The Monroe Magnum Severe Service Load Adjusting Shock Absorber, part number 550055, is built for rear suspension service on demanding fleet and work vehicles. It is engineered for stability and ride control in towing, hauling, municipal, emergency, and jobsite use.

This Monroe Magnum Severe Service line focuses on reinforced components and load-adjusting performance for vehicles that spend more time under heavy duty than in everyday commuting. For applications such as Ford Crown Victoria, Lincoln Town Car, and Mercury Grand Marquis rear suspension service, 550055 is a direct-fit option for severe-duty use.

Key Features

• Load-adjusting rear shock absorber for heavy service conditions
• Enhanced components for improved stability and ride control
• Dust shield included with plastic dust shield material
• Extended length: 20.125 in.; compressed length: 12.375 in.
• Travel length: 7.75 in.
• Upper mount: stem mount with 2.375 in. stem length and 3/8 in.-16 thread pitch
• Lower mount: loop bushing and sleeve mount with 12 mm sleeve ID and 1.5 in. sleeve OAL
• Extended bumper stop: yes

Detailed Description

Monroe Magnum Severe Service shock absorbers are built for vehicles that regularly carry loads, tow equipment, or operate in commercial duty cycles. Part number 550055 uses a rear stem-to-loop mounting design and includes a dust shield to help protect the shock body in harsh road environments. The shock’s dimensions and mounting style make it a practical replacement for severe-service rear suspension applications on 2003-2011 Ford Crown Victoria, 2003-2011 Lincoln Town Car, and 2003-2011 Mercury Grand Marquis, including police package, taxi package, and commercial chassis configurations where listed.

This part cross-references Bosch 69574 and Monroe Shocks & Struts 77955 for the same application.

What It Helps Address

• Rear-end sag and unstable ride quality under load
• Excessive bounce after towing or hauling
• Reduced control in fleet and commercial duty use
• Wear from repeated severe-service operation
• Suspension response issues on rear shock applications

Installation Notes and Tips

• Verify rear fitment by year, make, model, and package before installation.
• Confirm the upper stem mount and lower loop bushing/sleeve mount match the vehicle’s original shock configuration.
• Inspect mounting points, bushings, and sleeves for wear before installing the new shock absorber.
• Use the listed compressed and extended lengths to confirm suspension travel clearance.
• Check for police, taxi, towing, hauling, or commercial chassis notes where applicable.

Quality Assurance

Monroe Magnum Severe Service shocks are engineered for hardworking emergency, municipal, fleet, and jobsite vehicles, with enhanced components aimed at stable ride control in demanding environments. Part number 550055 is built for severe-duty rear suspension service on the listed applications.