Rancho RS55386 Shock Absorber - Rear

Rancho RS5000X Rear Shock for GM SUVs

The Rancho RS5000X shock absorber is built for rear suspension service on select GMC, Buick, and Oldsmobile SUVs. Part number RS55386 uses Rancho’s RS5000X valving and compression control to improve handling on pavement and stability on rough roads.

RS5000X Product Line Details

Rancho RS5000X shocks are tuned for drivers who want more controlled suspension response without changing the vehicle’s basic ride height. This line focuses on balanced on-road and off-road performance, with valving intended to manage compression movement and reduce harshness over uneven surfaces.

Key Features

• Rear suspension shock absorber for select GM applications
• RS5000X valving for improved overall handling response
• Advanced compression functionality for more controlled damping
• Dust shield included to help protect the shock body
• Extended bumper stop included
• Loop bushing and sleeve upper mount with 1/2 in. sleeve ID and 1.11/16 in. sleeve OAL
• Lower mount code LS63 and upper mount code LS40
• Compressed length: 14.56 in.; extended length: 23.09 in.; travel length: 8.53 in.

Detailed Description

Rancho RS55386 is a rear suspension shock absorber engineered for 2002-2009 GMC Envoy, 2004-2007 Buick Rainier, 2002-2006 GMC Envoy XL, 2004-2005 GMC Envoy XUV, and 2002-2004 Oldsmobile Bravada models with 0 inch raised height where noted. The RS5000X design uses exclusive valving and compression control to help the suspension respond more consistently during daily driving and uneven-road use. This shock also includes a dust shield and extended bumper stop, with a reserve tube diameter of 2.251 in. for the specified fitment.

This part cross-references KYB 343395 for the same application.

What It Helps Address

• Excessive rear-end bounce over bumps
• Loose or unsettled rear suspension feel
• Reduced control during highway driving
• Harsh response on rough or uneven roads
• Worn rear shock performance on GM SUV applications

Installation Notes and Quality

Verify rear fitment by year, make, model, and ride-height notes before installation. Confirm the upper and lower mount codes match the vehicle’s suspension configuration, and inspect surrounding bushings and mounting points during replacement. Rancho RS55386 is a direct-fit rear shock absorber for the listed applications, including GMC Envoy, Buick Rainier, and Oldsmobile Bravada fitments.

Rancho RS5000X shocks are built around application-specific valving and suspension geometry details to support consistent damping performance in the listed vehicles.

Compatible Vehicles

• Fits 2002-2009 GMC Envoy, rear
• Fits 2004-2007 Buick Rainier, rear
• Fits 2002-2006 GMC Envoy XL, rear
• Fits 2004-2005 GMC Envoy XUV, rear
• Fits 2002-2004 Oldsmobile Bravada, rear