Monroe 58644 Shock Absorber and Coil Spring Assembly - Rear

Monroe 58644 Load Adjusting Shock Absorber

Monroe 58644 is a rear load adjusting shock absorber for light trucks that tow or carry changing cargo loads. It uses a heavy-gauge calibrated spring to respond to road and weight conditions, adding control as the vehicle load increases.

This Monroe Load Adjusting Shock Absorber line is built for applications where rear suspension behavior changes with payload, helping maintain more consistent ride control on Chevrolet Trailblazer and GMC Envoy platforms.

Key Features

• Load adjusting rear shock absorber for variable towing and hauling conditions
• Heavy-gauge calibrated spring reacts to changing road and load demands
• Dust shield included; metal construction
• Upper mounting code LS40 with loop bushing and sleeve mount
• Lower mounting code LS41 with loop bushing and sleeve mount
• Compressed length: 14.73 in.; extended length: 23.82 in.; travel length: 9.09 in.
• Fits rear suspension applications on Chevrolet Trailblazer, GMC Envoy, Trailblazer EXT, Envoy XL, and Envoy XUV

Product Details

Monroe 58644 is a suspension shock absorber and coil spring assembly engineered for rear applications where load changes affect ride height and damping response. The calibrated spring adds resistance as demand increases, which helps the rear suspension stay more composed during towing, hauling, and uneven road conditions. This part cross-references Monroe Shocks & Struts 58644 for the same application.

Fits 2002-2009 Chevrolet Trailblazer, Rear. Fits 2002-2009 GMC Envoy, Rear. Fits 2002-2006 Chevrolet Trailblazer EXT, Rear. Fits 2002-2006 GMC Envoy XL, Rear. Fits 2004-2005 GMC Envoy XUV, Rear.

What It Helps Address

• Rear-end sag when cargo or trailer weight increases
• Excessive bounce over rough or uneven pavement
• Reduced control in towing and hauling conditions
• Inconsistent rear ride behavior as load changes
• Wear-related loss of damping performance in the rear suspension

Installation Notes

Verify upper and lower mounting codes LS40 and LS41 before installation. Confirm compressed length, extended length, and travel length against the vehicle’s rear suspension dimensions to ensure proper fitment. Inspect surrounding suspension components, bushings, and mounts during replacement, and follow the vehicle service procedure for shock absorber installation.

Quality Assurance

Monroe is a recognized suspension brand with a product line focused on load-adjusting rear shock control for trucks and SUVs that tow or carry varying loads. Monroe 58644 is built to match the stated mounting and dimensional specifications for the listed rear applications.