Monroe 5818 Shock Absorber - Rear

Monroe OESpectrum Rear Shock Absorber

The Monroe OESpectrum Passenger Car Shock Absorber, part number 5818, is built to restore factory-style drivability and road control on select rear suspension applications. It is designed to filter out noise, vibration, and harshness while maintaining precise handling response for classic passenger cars.

This rear shock absorber is a direct-fit option for applications such as the Chevrolet Chevette, Toyota Cressida, Toyota Corona, Ford Thunderbird, Mercury Cougar, Mercury Montego, Nissan 510 wagon, Chevrolet Camaro, Pontiac Firebird, Chevrolet Corvette, and Buick LeSabre with air suspension.

Key Features

• Monroe OESpectrum Passenger Car Shock Absorber for rear suspension use
• Part number 5818 for application-specific replacement searches
• Compressed length: 11.625 in.
• Extended length: 19.375 in.
• Travel length: 7.75 in.
• Metal dust shield included for added protection
• Upper mount: stem mount with 2.3/8 in. stem length x 3/8 in.-16 thread pitch
• Lower mount: L1/CP3

Product Details

Monroe OESpectrum shocks are engineered for drivers who want original-equipment ride characteristics without sacrificing steering and body control. This design focuses on damping consistency and reduced harshness, making it a practical choice for older vehicles where restoring predictable rear suspension behavior matters. The 5818 shock absorber is listed for rear applications across a wide range of classic cars, including 1976-1987 Chevrolet Chevette, 1978-1987 Toyota Cressida, 1967-1973 Toyota Corona, 1977-1979 Ford Thunderbird, 1974-1979 Mercury Cougar, 1972-1976 Mercury Montego, 1968-1973 Nissan 510 wagon, 1968-1969 Chevrolet Camaro with multi-leaf rear springs, 1968 Pontiac Firebird, 1953-1962 Chevrolet Corvette, and 1959 Buick LeSabre with air suspension. This part cross-references KYB 343039 for the same application.

What It Helps Address

• Excessive rear-end bounce after bumps or dips
• Loose or unsettled handling in stock suspension setups
• Harshness and vibration transmitted into the cabin
• Reduced control from worn rear shock damping
• Uneven ride quality on classic passenger cars

Installation Notes and Tips

Verify rear fitment by year, make, model, and suspension configuration before ordering. This shock uses a stem-style upper mount and L1/CP3 lower mounting code, so matching the original mounting style is important for proper installation. Confirm compressed and extended length against the vehicle’s suspension travel to ensure correct operating range. For best results, inspect related suspension components such as bushings, springs, and mounting points during replacement.

Quality Assurance

Monroe designs the OESpectrum line to restore factory drivability and performance while maintaining handling precision and control. The product is built around OE-style ride quality expectations for passenger car applications and is supported by Monroe’s established suspension engineering background.