Keep a hardworking truck planted and controlled with the Monroe Gas-Magnum Rear Shock Absorber 34920. This gas-charged rear shock is engineered for full-size trucks and vans, and it installs as a direct-fit rear replacement for the 1977-1986 Chevrolet K30, 1977-1978 GMC K35, 1979-1986 GMC K3500, 1987-1988 Chevrolet V30, 1987-1991 GMC V3500, and 1989-1991 Chevrolet V3500. See the Buyer's Guide tab for engine-level fitment.
- Built for trucks and vans: full-displaced valving on the compression cycle helps deliver firm control without a harsh ride.
- Larger capacity: a bigger bore and 2-in. reserve tube hold more oil for greater fluid capacity than standard 1-in. bore shocks, so it works efficiently with less effort.
- Durable internals: a sintered iron piston and self-lubricating fluid seal reduce friction against the piston rod; a heavy-duty nitrocarburized rod is used on non-dust-shield units. OE all-weather fluid handles extreme temperatures.
- Nitrogen gas-charge: helps maintain tire-to-road contact by reducing aeration and shock fade for improved ride and handling.
Backed by Monroe's Limited Lifetime Warranty and Feel the Difference Guarantee.
Interchange: 3187845 · AT43 · AT46 · ATG43 · HD115 · 342529 · 58412 · 344386 · 76920 · 12140425
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does this shock absorber do?
It's a rear gas-charged hydraulic shock that dampens spring motion to help control ride and handling. Its nitrogen gas-charge reduces aeration and shock fade to help maintain tire-to-road contact.
Which vehicles does the Monroe 34920 fit?
It's a rear-position fit for the 1977-1986 Chevrolet K30, 1977-1978 GMC K35, 1979-1986 GMC K3500, 1987-1988 Chevrolet V30, 1987-1991 GMC V3500, and 1989-1991 Chevrolet V3500. See the Buyer's Guide tab.
What are signs my rear shocks may need replacing?
Excessive bouncing after bumps, nose-dive or sway, uneven or cupped tire wear, and fluid leakage may indicate worn shocks. Diagnose the cause before replacing.
Should I replace both rear shocks at once?
Replacing shocks in axle pairs is recommended for balanced, even ride control. This listing is for one shock; order two to do the full rear axle together.
How is the Gas-Magnum different from a standard shock?
It uses a larger bore and a 2-in. reserve tube to hold more oil than standard 1-in. bore shocks, plus full-displaced compression valving designed for firm control on trucks and vans.
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