Monroe 58637 Shock Absorber and Coil Spring Assembly - Rear

Monroe Load Adjusting Shock Absorber 58637

Monroe 58637 is a rear load adjusting shock absorber for light trucks that tow or carry changing loads. It uses a heavy-gauge calibrated spring to respond to road and weight conditions, adding control as the vehicle works harder.

Compatible with Chevrolet Silverado 1500 Classic and GMC Sierra 1500 Classic rear applications, this Monroe Load Adjusting Shock Absorber is built for towing and hauling use where suspension response matters. The Monroe 58637 part number is also a direct reference point for shoppers comparing replacement shocks for these truck platforms.

Key Features

• Rear load adjusting shock absorber for light truck suspension service
• Heavy-gauge calibrated spring helps adapt to changing load and road conditions
• Dust shield included with metal construction
• Extended bumper stop included
• Loop bushing and sleeve upper and lower mounts, LS47 code
• Travel length: 8.875 in.; compressed length: 16.875 in.; extended length: 25.75 in.
• Cross-reference: Monroe Shocks & Struts 43181 for the same application

Product Details

The Monroe Load Adjusting Shock Absorber line is aimed at trucks that see frequent towing or hauling, where rear suspension control changes with payload. Monroe 58637 uses a calibrated spring assembly to add support as demand increases, while the metal dust shield helps protect the shock body from road debris. This rear shock absorber is listed for 1999-2006 Chevrolet Silverado 1500, 1999-2006 GMC Sierra 1500, 2007 Chevrolet Silverado 1500 Classic, and 2007 GMC Sierra 1500 Classic in rear position applications with the noted equipment exclusions.

Common Problems It Helps Address

• Rear-end sag when carrying cargo or towing
• Excessive bounce after bumps or dips
• Reduced control under changing load conditions
• Wear-related loss of damping performance
• Need for a rear shock absorber matched to truck towing and hauling use

Installation Notes and Tips

Verify rear fitment by year, make, model, and equipment notes before installation. This part uses loop bushing and sleeve mounts at both ends with a 9/16 in. sleeve ID and 1.5/8 in. sleeve OAL. Confirm compressed and extended lengths against the vehicle’s suspension travel, and inspect mounting points, bushings, and sleeves for wear before installing Monroe 58637.

Quality Assurance

Monroe is a recognized suspension brand with a product line focused on load-adjusting shock absorber applications for trucks that tow or haul varying loads. Monroe 58637 is built around that application-specific design and is listed with OE-style fitment references for the covered Chevrolet Silverado 1500, Silverado 1500 Classic, GMC Sierra 1500, and Sierra 1500 Classic rear applications.