Westar ST-3978 Suspension Coil Spring Seat - Front Upper

Suspension Coil Spring Seat for Volvo Front Upper

Westar ST-3978 is a suspension coil spring seat for the front upper position on select Volvo applications. It is built to provide the pivot point the suspension rotates on, helping the system maintain proper geometry for steering response and reduced tire and component wear.

Key Features

• Front upper suspension coil spring seat for select Volvo models
• Provides a pivot point for suspension movement and rotation
• Helps keep suspension dynamics within the correct operating range
• Includes a locking function to secure the strut and body together
• Noise-dampening design helps reduce road noise and vibration transfer into the cabin
• Westar ST-3978 is built with application-specific materials and a protective finish for durability

Detailed Description

Westar ST-3978 is engineered for Volvo XC90, C70, V70, S60, S80, S70, and 850 front upper suspension service where the coil spring seat is the required replacement part. By supporting suspension rotation and securing the strut assembly, this component helps preserve alignment behavior and reduce unwanted movement that can contribute to uneven tire wear and added stress on related parts. This part cross-references Monroe Shocks & Struts 903978 for the same application. The part number ST-3978 is also commonly searched as a direct replacement reference for Volvo front upper suspension repair.

What It Helps Address

• Clunking or noise from the front upper strut area
• Excess vibration transmitted through the suspension
• Loose or worn spring seat support at the strut assembly
• Suspension geometry issues that can affect steering feel
• Premature tire or component wear related to worn upper spring support

Installation Notes and Tips

Compatible With 2003-2014 Volvo XC90, front upper; 2006-2007 Volvo C70, front upper; 1998-2004 Volvo C70, front upper; 1998-2007 Volvo V70, front upper; 2001-2006 Volvo S60, front upper; 1999-2006 Volvo S80, front upper; 1998-2000 Volvo S70, front upper; and 1993-1997 Volvo 850, front upper. Verify the vehicle’s suspension configuration before ordering, including notes such as w/o Electronic Suspension, exc. NIVOMAT Rear Suspension, or exc Auto Rear Leveling where listed. For best results, inspect the surrounding strut components during service and confirm the replacement matches the original front upper spring seat design. The ST-3978 part number should be matched to the application before installation.

Quality Assurance

Westar states that its suspension components are made with application-specific materials and finished to help extend service life. ST-3978 is produced as a direct-fit replacement for the listed Volvo applications and is intended to meet the demands of everyday suspension service.