KYB SM5594 Coil Spring Insulator - Rear Upper

KYB SM5594 Coil Spring Insulator for Altima

KYB SM5594 is a rear upper coil spring insulator for select Nissan Altima models. It is built to replace hardened or worn spring seats that can transmit vibration and create unwanted suspension noise.

For drivers searching for a 1993-2001 Nissan Altima rear upper spring insulator, this KYB Mount Components part is an OE-style replacement focused on restoring quiet suspension operation and proper spring isolation.

Key Features

• Replacement coil spring insulator for the rear upper suspension position
• Helps reduce squeaks, rattles, and vibration noise from worn insulators
• Built to match or exceed original equipment design and quality
• Supports smoother suspension performance by isolating the spring from the mount
• KYB Mount Components line for application-specific suspension replacement parts

Product Details

KYB Mount Components are engineered as OE-quality replacement parts for suspension service. The SM5594 spring insulator is designed for the rear upper location on the Nissan Altima and addresses the common wear that occurs when factory rubber hardens over time. By restoring the spring’s isolation point, this part helps maintain quieter operation and more consistent suspension feel. If you are replacing a worn rear upper coil spring insulator on a 1993-2001 Nissan Altima, KYB SM5594 provides a direct-fit service solution.

This part cross-references Nissan 550340E000 and 550342B500 for the same application.

What It Helps Fix

• Squeaking from the rear suspension
• Rattling or clunking caused by deteriorated spring isolation
• Vibration noise transferred through hardened insulators
• Loss of OE-style spring seating support
• Noise concerns during normal driving over bumps and rough roads

Installation Notes

Fits 1993-2001 Nissan Altima, rear upper. Confirm the suspension position before installation and inspect the surrounding spring seat and mount components for wear. Proper spring compression tools and suspension service procedures are required when servicing coil spring components.

Quality Assurance

KYB is known for OE-quality suspension replacement components, and the Mount Components line is built for application-specific fit and function. The SM5594 is engineered to deliver the design and quality expected for suspension service on the Nissan Altima.