KYB SM5421 Coil Spring Insulator - Front

KYB SM5421 Coil Spring Insulator

KYB SM5421 is a coil spring insulator for front suspension applications on select Jeep Liberty and Dodge Nitro models. It is built to replace worn spring seats that can transmit noise and vibration through the suspension.

Key Features

• High-quality replacement spring insulator for front suspension service
• Helps reduce squeaks, rattles, and vibration noise from hardened insulators
• Built to match or exceed original equipment design and quality
• OE-style fitment for application-specific suspension repair
• KYB Mount Components line focuses on suspension mounting parts for precise replacement needs

Detailed Description

As part of KYB’s Mount Components line, the SM5421 spring insulator is engineered for suspension mounting locations where the spring seat must isolate road vibration and reduce noise transfer. For Jeep Liberty and Dodge Nitro front suspension service, this part number supports a direct replacement approach that restores the function of the original insulator without changing the suspension layout. KYB SM5421 is a practical choice when the original spring seat has hardened, cracked, or lost its ability to damp vibration.

This part cross-references Gabriel 143255 for the same application.

What It Helps Solve

• Squeaks from worn or hardened spring insulators
• Rattles caused by deteriorated suspension mounting surfaces
• Vibration noise transmitted through the front suspension
• Loss of isolation at the coil spring seat
• Noise concerns during Jeep Liberty or Dodge Nitro front-end suspension repair

Installation Notes and Tips

• Fits 2002-2012 Jeep Liberty, front, upper and lower; Mount Components.
• Fits 2007-2011 Dodge Nitro, front, upper and lower; Mount Components.
• Inspect the surrounding spring seat and mounting surfaces for wear before installation.
• Confirm the front suspension configuration matches the listed application before ordering KYB SM5421.
• Use proper suspension service procedures when replacing coil spring insulators.

Quality Assurance

KYB is known for OE-quality suspension replacement components, and the SM5421 is built to follow that standard for application-specific fit and function. Its design focuses on restoring the noise isolation and vibration control expected from a proper coil spring insulator in front suspension service.