KYB SM5178 Suspension Strut Mount - Rear

KYB SM5178 Rear Strut Mount for Lexus LS400

KYB SM5178 is a rear suspension strut mount for select 1990-1994 Lexus LS400 models without air suspension. It replaces worn mount components that can transmit vibration, noise, and harshness into the cabin while helping restore proper suspension feel.

Built under KYB’s Mount Components line, this rear strut mount is made as an OE-quality replacement for the specific application. It is a direct choice for drivers searching for a rear strut mount for 1990-1994 Lexus LS400, rear suspension mount replacement, or KYB SM5178 fitment details.

Key Features

• OE-quality replacement strut mount for the rear suspension
• Superior rubber helps reduce noise, vibration, and harshness
• Mount bearing design supports smoother steering response and front-end alignment retention where applicable
• Matched-grade studs and nuts for proper component fitment
• Designed for the 1990-1994 Lexus LS400, rear, without air suspension

Product Details

The KYB Mount Components line focuses on replacement suspension hardware that matches the needs of each application. SM5178 is engineered to replace aged rear strut mount components on the Lexus LS400, helping address the effects of hardened vibration insulators and worn mounting parts. For shoppers comparing rear strut mount replacement options, KYB SM5178 offers a direct-fit solution for the specified Lexus LS400 years.

This part cross-references Monroe Shocks & Struts 904918 for the same application.

Common Issues This Part Can Address

• Rear suspension noise from worn mount components
• Excess vibration transferred into the cabin
• Harsh ride feel caused by deteriorated rubber insulators
• Loose or inconsistent suspension mounting at the rear
• Reduced steering and alignment stability when related mount wear is present

Installation Notes

Fits 1990-1994 Lexus LS400, rear, without air suspension. Confirm the vehicle’s suspension configuration before ordering, since this part is not listed for air-suspension models. Inspect related strut and suspension components during replacement to ensure the new mount is installed on a sound assembly.

Quality Assurance

KYB is known for OE-style suspension replacement components, and SM5178 is built to meet the application-specific requirements of the listed Lexus LS400 fitment. The part number is KYB SM5178.