Monroe 34678 Shock Absorber - Rear

Monroe Gas-Magnum Shock Absorber 34678

Monroe Gas-Magnum Shock Absorber 34678 is built for midsize and full-size trucks and vans that need firm suspension control without a harsh ride. It uses a larger fluid capacity than standard 1-inch bore shocks, helping the shock absorber work more efficiently under load and on rough roads.

Key Features

• Gas-Magnum shock absorber for rear suspension applications
• Firm damping response with controlled ride quality
• Up to twice the fluid capacity of standard 1-inch bore shocks
• Metal dust shield helps protect the shaft area from road debris
• Loop bushing and sleeve upper and lower mounts
• Extended bumper stop included in the shock design
• Compatible with vehicles that do not use electronic adjustable suspension

Product Details

The Monroe Gas-Magnum Shock Absorber 34678 is part of Monroe’s Gas-Magnum line, which focuses on heavier-duty truck and van suspension needs. This rear shock uses a loop bushing and sleeve mount at both ends, with a 9/16-inch sleeve ID and 1.5/8-inch sleeve OAL, and it measures 25.5 inches extended, 16.75 inches compressed, with 8.75 inches of travel. The metal dust shield adds protection, while the extended bumper stop is built into the design for added suspension control. This part cross-references Monroe Shocks & Struts 344386 for the same application.

Vehicle Fitment

• Fits 2007 Chevrolet Silverado 1500 Classic, rear; without electronic adjustable suspension.
• Fits 2007 GMC Sierra 1500 Classic, rear; without Z71 Off Road Package and without Electronic Adjustable Suspension.
• Fits 1999-2006 Chevrolet Silverado 1500, rear; without electronic adjustable suspension.
• Fits 1999-2006 GMC Sierra 1500, rear; without Z71 Off Road Package and without Electronic Adjustable Suspension.

Common Issues This Part Can Address

• Excessive rear-end bounce over uneven pavement
• Reduced control when carrying cargo or towing
• Harsh or unstable ride from worn rear shocks
• Suspension noise caused by deteriorated shock damping
• Poor body control during braking and cornering

Installation Notes

Confirm rear suspension configuration before ordering, especially electronic adjustable suspension and Z71 Off Road Package exclusions listed in the fitment data. Match the upper and lower loop bushing and sleeve mount style to the original shock location, and verify compressed and extended length measurements against the vehicle’s suspension travel before installation. Monroe 34678 is a rear shock absorber for specific Chevrolet Silverado 1500 and GMC Sierra 1500 applications.

Quality Assurance

Monroe positions the Gas-Magnum line for truck and van duty, with a design that emphasizes fluid capacity and controlled damping for more efficient operation. Monroe 34678 is listed with a limited lifetime warranty in the fitment notes for the covered applications.