Monroe 34658 Shock Absorber - Rear

Monroe Gas-Magnum Rear Shock Absorber

The Monroe Gas-Magnum Shock Absorber 34658 is built for midsize and full-size trucks and vans that need firm rear suspension control without a harsh ride. It uses increased fluid capacity to manage heat and motion more efficiently, making it a practical choice for Ford F-150 and F-150 Heritage rear suspension service.

Key Features

• Gas-Magnum shock absorber for rear suspension applications
• Designed for midsize and full-size trucks and vans
• Firm damping control with a ride quality that stays controlled
• Up to twice the fluid capacity of standard 1-inch bore shocks
• Metal dust shield included for added protection
• Compressed length: 16 in.; extended length: 27.5 in.; travel length: 11.5 in.
• Upper mount: stem mount with 2.3/8 in. stem length and 3/8 in.-16 thread pitch
• Lower mount: loop bushing and sleeve mount with 12 mm sleeve ID and 1.1/2 in. sleeve OAL

Product Details

Monroe Gas-Magnum shocks are engineered for rear axle control on heavier-duty truck and van suspensions where consistent damping matters. Part number 34658 uses a stem upper mount and loop lower mount configuration, along with a metal dust shield to help protect the shock body in demanding road conditions. This part cross-references KYB 344375 and Rancho RS55234 for the same application. For Ford F-150 rear shock replacement, Monroe 34658 matches the listed fitment for 1997-2002 Ford F-150, rear; 2003 Ford F-150, rear; and 2004 Ford F-150 Heritage, rear, with the noted GVW exclusions.

What It Helps Address

• Excessive rear-end bounce over uneven pavement
• Reduced control when carrying or towing heavier loads
• Harsh or inconsistent damping from worn rear shocks
• Rear suspension instability during braking and cornering
• Noise and wear associated with degraded shock performance

Installation Notes and Tips

Verify rear shock length, mount style, and sleeve dimensions before installation. Confirm the vehicle is within the listed Ford F-150 and F-150 Heritage fitment and check the GVW exclusions shown in the application data. Inspect mounting points, bushings, and sleeves for wear before installing Monroe 34658, and replace any damaged suspension hardware as needed.

Quality Assurance

Monroe’s Gas-Magnum line is positioned for truck and van suspension service where controlled damping and higher fluid capacity are important. Part number 34658 is built to the published dimensions and mounting configuration for the listed rear applications, supporting a direct-fit replacement approach for the specified Ford F-150 models.