Monroe 550018 Shock Absorber - Rear

Monroe Magnum Severe Service Shock Absorber 550018

Monroe Magnum Severe Service Shock Absorber 550018 is built for rear suspension applications that see frequent load changes, stop-and-go duty, and rough road conditions. It is a fitment-based replacement for select Ford Crown Victoria, Lincoln Town Car, Mercury Grand Marquis, and Mercury Marauder applications with severe-service configurations.

Key Features

• Rear shock absorber for severe-service use
• Compressed length: 12.5 in.; extended length: 20 in.; travel length: 7.5 in.
• Metal dust shield included for added protection
• Extended bumper stop: yes; compressed bumper stop: no
• 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

Product Details

The Monroe Magnum Severe Service shock absorber line is engineered for emergency, municipal, fleet, and jobsite vehicles that need consistent ride control under demanding conditions. Part number 550018 uses enhanced components to improve stability and suspension control in rear applications where durability matters. This part cross-references KYB 555603 for the same application.

Compatible With 2003-2011 Ford Crown Victoria, rear with Taxi Package; 2003-2011 Lincoln Town Car, rear Commercial Chassis; 2003-2011 Mercury Grand Marquis, rear with Police Package or Taxi Package; 2003-2004 Ford Grand Marquis, rear with Police Package or Taxi Package; and 2003-2004 Mercury Marauder, rear. Monroe 550018 is a direct-fit option for these severe-service rear suspension setups.

Common Issues This Part Can Address

• Excessive rear bounce over uneven pavement
• Reduced stability during frequent stop-and-go driving
• Worn ride control in fleet or duty-cycle use
• Rear suspension harshness from aging shock absorbers
• Loss of damping performance under heavier service demands

Installation Notes and Tips

Verify rear fitment by year, make, model, and package before ordering. Confirm the upper stem mount and lower loop bushing and sleeve mount match the vehicle’s existing shock configuration. Inspect surrounding suspension components, mounting points, and bushings during replacement to ensure proper operation after installation.

Quality Assurance

Monroe Magnum Severe Service shocks are built for demanding fleet and municipal use with reinforced components and application-specific fitment. Part number 550018 is engineered for the listed rear applications and severe-service duty cycles.