KYB SM5840 Suspension Shock Mounting Kit - Rear Upper

KYB Rear Upper Strut Mount Kit

KYB SM5840 is a suspension shock absorber mounting kit built for rear upper applications on select Toyota, Lexus, and Scion vehicles. It replaces worn vibration insulators and mount components that can transmit road noise, harshness, and steering-related movement into the cabin.

For drivers searching for a rear upper strut mount for a Toyota Sienna, Toyota Prius, or Lexus CT200h, KYB Mount Components are engineered as OE-quality replacement parts for the specific application.

Key Features

• OE-quality replacement strut mount for the listed application
• Superior rubber helps reduce noise, vibration, and harshness
• Mount bearings support smoother steering response and front-end alignment retention
• Matched-grade studs and nuts for proper fitment
• Designed to optimize suspension performance on the vehicle it was built for

Product Details

KYB Mount Components focus on restoring the function of the upper mount assembly by replacing hardened insulators and worn bearing components. On vehicles such as the Toyota Sienna, Toyota Prius, Scion tC, and Lexus CT200h, a worn rear upper mount can allow extra vibration to pass through the suspension and reduce ride quality. KYB SM5840 is built to address that wear with application-specific construction and materials that match the original design intent.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Fix

• Rear suspension noise from worn mount insulators
• Harshness felt over bumps and rough pavement
• Excess vibration transferred into the vehicle body
• Steering feel affected by worn bearing plates on supported applications
• Alignment instability caused by degraded upper mount components

Installation Notes

Install SM5840 only on the listed rear upper applications and verify the vehicle’s suspension layout before replacement. Inspect the surrounding strut hardware, spring seat, and bearing surfaces for wear before reassembly. Proper torque and alignment checks after installation help confirm correct suspension operation.

Quality Assurance

KYB is known for OE-focused suspension components, and the Mount Components line is built around application-specific replacement parts for consistent fit and function. SM5840 is engineered to restore the mount’s original role in isolating vibration and supporting suspension movement on the listed vehicles.

Compatible Vehicles

• Fits 2017-2018 Toyota Corolla iM, Rear Upper
• Fits 2016-2018 Toyota Mirai, Rear Upper
• Fits 2011-2017 Lexus CT200h, Rear Upper
• Fits 2004-2017 Toyota Sienna, Rear Upper
• Fits 2016 Scion iM, Rear Upper
• Fits 2011-2016 Scion tC, Rear Upper
• Fits 2008-2015 Scion xB, Rear Upper
• Fits 2010-2015 Toyota Prius, Rear Upper
• Fits 2010-2012 Lexus HS250h, Rear Upper