Monroe 34920 Shock Absorber - Rear

Monroe Gas-Magnum Rear Shock Absorber

The Monroe Gas-Magnum Shock Absorber 34920 is built for midsize and full-size trucks and vans that need firm rear suspension control without a harsh ride. It is a direct-fit rear shock option for select Chevrolet and GMC heavy-duty applications, including Chevrolet K30, Chevrolet V30, Chevrolet V3500, GMC K3500, and GMC V3500 models.

Key Features

• Gas-Magnum shock absorber for rear suspension use
• Designed for midsize and full-size trucks and vans
• Up to twice the fluid capacity of standard 1-inch bore shocks
• Metal dust shield included to help protect the shaft area
• Loop bushing and sleeve upper and lower mounts
• Upper and lower mounting code: LS47
• Extended length: 26.125 in.; compressed length: 15.5 in.; travel length: 10.625 in.

Product Details

Monroe Gas-Magnum shock absorbers are engineered for heavier-duty rear suspension demands, using increased fluid capacity to improve control and reduce operating effort. For drivers searching for a Monroe 34920 rear shock absorber for Chevrolet K30 or GMC K3500 applications, this part provides the dimensions and mounting style needed for the listed fitments. This part cross-references KYB 344386 for the same application.

What It Helps Address

• Excessive rear-end bounce over uneven pavement
• Reduced control when carrying load or towing
• Rear suspension instability on older truck and van platforms
• Harsh or inconsistent damping from worn shock absorbers
• Noise or contamination concerns around the shock shaft area

Installation Notes

Verify rear position, mounting code LS47, and the listed compressed and extended lengths before installation. This Monroe Gas-Magnum Shock Absorber 34920 uses loop bushing and sleeve mounts at both ends, with a 9/16 in. sleeve ID and 1.5/8 in. sleeve OAL. Confirm clearance, suspension travel, and vehicle-specific fitment for Chevrolet K30, Chevrolet V30, Chevrolet V3500, GMC K3500, and GMC V3500 rear applications.

Quality Assurance

Monroe designs the Gas-Magnum line for truck and van suspension service where firmer damping and higher fluid capacity are important. The listed fitment includes a limited lifetime warranty on this shock absorber.

• Fits 1977-1986 Chevrolet K30, Rear
• Fits 1987-1988 Chevrolet V30, Rear
• Fits 1989-1991 Chevrolet V3500, Rear
• Fits 1979-1986 GMC K3500, Rear
• Fits 1987-1991 GMC V3500, Rear