Monroe 5664 Shock Absorber - Rear

Monroe OESpectrum Rear Shock for Cadillac ATS

The Monroe OESpectrum Passenger Car Shock Absorber is built to restore factory-style drivability and road control on the rear suspension. For 2013-2019 Cadillac ATS models, part number 5664 focuses on handling precision while reducing noise, vibration, and harshness.

Key Features

• Rear shock absorber for 2013-2019 Cadillac ATS
• Monroe OESpectrum passenger car shock absorber line
• Part number 5664 for direct application lookup
• Extended bumper stop: Yes
• Compressed length: 14.2 in; extended length: 20.44 in; travel length: 6.24 in
• Upper mounting type: stem mount with M10 thread pitch
• Lower mounting type: loop bushing and sleeve mount with 1 in sleeve ID x 2 in sleeve OAL

Product Details

Monroe OESpectrum shocks are tuned to bring back original factory ride characteristics without sacrificing control. This rear shock absorber for Cadillac ATS applications uses a stem upper mount and loop bushing lower mount, making it a fitment-specific suspension replacement for the rear position. Part number 5664 is also cross-referenced to KYB 3440053 for the same application.

The OESpectrum Passenger Car Shock Absorber line is focused on passenger-car ride quality, with damping characteristics aimed at improving body control and filtering out road harshness. For Cadillac ATS rear shock replacement searches, Monroe 5664 is a direct part number to reference when matching the correct suspension setup.

Common Problems It Can Address

• Excessive rear bounce after bumps
• Reduced rear-end stability during cornering
• Harsh ride feel from worn shock damping
• Noisy or unsettled suspension movement
• Loss of factory-like ride control on the rear axle

Installation Notes and Tips

Verify rear-position fitment against the vehicle’s suspension configuration before installation. Match the upper stem mount and lower loop bushing mount dimensions to the original shock, and confirm compressed and extended lengths for proper suspension travel. For 2013-2019 Cadillac ATS rear shock absorber replacement, compare the existing unit to Monroe 5664 and inspect surrounding mounts and bushings for wear before reassembly.

Quality Assurance

Monroe positions the OESpectrum line as a factory-style replacement option for passenger cars, with an emphasis on handling precision, control, and reduced noise, vibration, and harshness. Part number 5664 is engineered for the rear suspension application listed above and is supported by Monroe’s OE-focused product line approach.