Monroe 58643 Shock Absorber and Coil Spring Assembly - Rear

Monroe Load Adjusting Shock Absorber 58643

Monroe 58643 is a rear load adjusting shock absorber for light trucks that tow, haul, or carry changing cargo loads. It uses a heavy-gauge calibrated spring to add control as road conditions and vehicle weight become more demanding.

Compatible with 2004-2014 Ford F-150 rear applications and 2006-2008 Lincoln Mark LT rear applications, this Monroe Load Adjusting Shock Absorber is built for trucks that need consistent suspension response under varying load conditions.

Key Features

• Load adjusting design for rear suspension control under changing payload and towing demands
• Heavy-gauge calibrated spring helps respond to road and weight conditions
• Compressed length: 16.59 in.; extended length: 27.55 in.; travel length: 10.96 in.
• Metal dust shield included for added protection
• Upper and lower loop bushing & sleeve mounts with LS38 mounting code
• Rear shock absorber assembly for Ford F-150 and Lincoln Mark LT applications

Product Details

Monroe Load Adjusting Shock Absorber 58643 is engineered for rear suspension use on trucks that see frequent towing or hauling. The calibrated spring works with the shock body to help maintain control as load conditions change, making it a practical choice for a Ford F-150 rear shock replacement or a rear shock absorber for 2006-2008 Lincoln Mark LT models. This part cross-references Four Seasons 58643 for the same application.

With a metal dust shield, loop bushing and sleeve mounts at both ends, and a 10.96-inch travel length, this shock is built around the dimensions and mounting style needed for the listed rear applications. Monroe 58643 is a direct-fit suspension shock absorber and coil spring assembly for the specified vehicles.

Common Issues This Part Helps Address

• Rear-end sag when carrying cargo or towing
• Reduced control over rough or uneven roads
• Excessive bounce after bumps or load changes
• Inconsistent rear suspension response under varying weight
• Need for a rear shock replacement on a Ford F-150 or Lincoln Mark LT

Installation Notes and Tips

Verify rear fitment by year, make, model, and mounting style before installation. Confirm compressed length, extended length, and sleeve dimensions against the original shock to ensure proper suspension travel and mounting alignment. Inspect related suspension components, including bushings and mounting points, during replacement.

• Fits 2004-2014 Ford F-150, rear; compatible with vehicles used for towing and hauling applications.
• Fits 2006-2008 Lincoln Mark LT, rear; compatible with vehicles used for towing and hauling applications.

Quality Assurance

Monroe is a recognized suspension brand with a product line focused on load-adjusting shock absorber applications for trucks that carry changing loads. Monroe 58643 is built to the listed dimensions and mounting specifications for the confirmed rear fitments.