KYB SM5420 Coil Spring Insulator - Front Lower

KYB SM5420 Coil Spring Insulator

KYB SM5420 is a coil spring insulator for front lower suspension applications. It is built to replace worn vibration insulators that can create noise and reduce suspension refinement in select Chevrolet, Pontiac, and Oldsmobile vehicles.

Part of KYB’s Mount Components line, this spring seat and insulator is application-specific and focused on restoring OE-style suspension feel. It is a direct-fit replacement for vehicles such as the Chevrolet Malibu, Pontiac Grand Am, and Oldsmobile Alero.

Key Features

• High-quality replacement spring insulator for suspension service
• Reduces squeaks, rattles, and vibration noise from worn insulators
• Built to match or exceed original equipment design and quality
• Application-specific fitment for front lower suspension locations
• KYB SM5420 cross-references Monroe Shocks & Struts 904945 for the same application

Mount Components Line Details

KYB Mount Components are engineered as OE-style replacement parts for suspension mounting points. For applications that need a coil spring insulator, the line focuses on restoring proper spring seating and reducing unwanted vibration transfer without changing the vehicle’s original suspension layout.

Detailed Description

The KYB SM5420 coil spring insulator is designed to replace hardened or deteriorated spring seats that can transmit noise through the suspension. By renewing the contact point between the coil spring and the suspension assembly, it helps maintain quieter operation and more consistent suspension performance. This part is a strong match for drivers searching for a front lower coil spring insulator for 1997-2003 Chevrolet Malibu, 1999-2005 Pontiac Grand Am, or 1999-2004 Oldsmobile Alero.

It also fits 2004-2005 Chevrolet Classic, front lower, and 1997-1999 Oldsmobile Cutlass, front lower. The KYB SM5420 is a practical OE replacement choice when the original insulator has become compressed, cracked, or noisy.

What It Helps Solve

• Squeaks from worn spring contact points
• Rattles caused by hardened suspension insulators
• Vibration noise transferred into the cabin
• Poor spring seating from aged mount components
• Loss of suspension refinement at the front lower position

Installation Notes and Tips

Inspect the spring seat, insulator, and surrounding mount components before installation. Replace damaged or hardened related parts at the same time to help restore proper spring isolation. Confirm front lower placement and vehicle-specific fitment before service on the Chevrolet Malibu, Pontiac Grand Am, or Oldsmobile Alero.

Quality Assurance

KYB is known for OE-quality suspension replacement components, and the SM5420 is built to meet the design and quality expectations of original equipment applications. This part is engineered for consistent fit and dependable vibration isolation in the specified vehicles.