KYB SR4201 Suspension Strut and Coil Spring Assembly - Front

KYB Strut-Plus for Nissan Frontier

The KYB Strut-Plus SR4201 is a front suspension strut and coil spring assembly for the 2005-2021 Nissan Frontier. It is built to restore ride height, steering response, and vehicle control with an exact-fit, pre-assembled design.

As part of KYB’s Strut-Plus line, this assembly combines an OE-restoring KYB strut with a vehicle-specific coil spring and a stronger steel outer shell. It is engineered for the front suspension on the Nissan Frontier and is also designed to support vehicles equipped with electronic safety systems such as ESC and ABS.

Key Features

• Fits 2005-2021 Nissan Frontier, front
• KYB Excel-G strut with application-specific damping valves
• High-carbon steel coil spring developed around vehicle corner weights and ride height targets
• Pre-assembled for professional installation and exact fitment
• Engineered to help maintain proper operation of electronic safety systems
• Assembled in the USA
• Recipient of a 2018 industry award in the import aftermarket category

Product Details

The SR4201 is part of KYB’s Strut-Plus product line, which focuses on restoring suspension geometry and ride height with a complete front strut and spring assembly. For the Nissan Frontier, this means a direct replacement built around OE-style ride and handling targets rather than a universal-fit approach. KYB’s role as an original equipment supplier informs the damping and spring tuning used in this assembly, helping the truck maintain stable front-end control and predictable steering feel. This part cross-references Monroe Shocks & Struts (e.g., 181102, 271102) for the same application.

What It Helps Address

• Front-end sag or uneven ride height
• Excessive bounce, nose dive, or reduced damping control
• Loose or imprecise steering response
• Worn strut and spring components on a 2005-2021 Nissan Frontier
• Suspension performance concerns tied to front ride quality and stability

Installation Notes

Install on the front suspension only and follow the vehicle manufacturer’s instructions for replacement of the strut and coil spring assembly. Because this is a pre-assembled unit, it reduces the need to transfer spring components during service. Verify side, position, and application details against the vehicle before installation. For best results, inspect related suspension parts and alignment settings after replacement.

Quality Assurance

KYB manufactures this Strut-Plus assembly as an OE-style replacement built to restore handling and control on the Nissan Frontier. The design uses application-specific damping and a vehicle-matched spring to help return the suspension to factory-style ride height and response.