Keep hardworking trucks and vans planted with the Monroe Gas-Magnum Suspension Shock Absorber 34920, a rear-position gas-charged shock built to deliver firm control without a harsh ride. It fits the 1977-1986 Chevrolet K30, 1987-1988 Chevrolet V30, 1989-1991 Chevrolet V3500, 1977-1978 GMC K35, 1979-1986 GMC K3500, and 1987-1991 GMC V3500 — see the Buyer's Guide tab for engine-level detail.
- Designed for trucks and vans: engineered for full-size trucks and vans with full-displaced valving on compression cycles for controlled ride and handling.
- Built to last: heavy-duty nitrocarburized rod (non-dust-shield units only) and sintered iron piston enhance durability, while a self-lubricating fluid seal reduces friction against the piston rod.
- Consistent ride: OE all-weather fluid uses special modifiers to handle extreme temperatures and help ensure smooth rod reaction.
- Improves performance: nitrogen gas-charge helps maintain tire-to-road contact by reducing aeration and shock fade.
A larger bore and bigger 2-in. reserve tube hold more oil for greater capacity and longer service life. Backed by Monroe's Limited Lifetime Warranty and exclusive Feel the Difference Guarantee. Shocks work best as a matched pair — replace both sides on the axle together for balanced ride control.
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 Monroe Gas-Magnum shock do?
It's a rear gas-charged suspension shock absorber that dampens spring movement to help control ride and handling. Its nitrogen gas-charge helps maintain tire-to-road contact by reducing aeration and shock fade.
Which vehicles does the 34920 fit?
It fits the 1977-1986 Chevrolet K30, 1987-1988 Chevrolet V30, 1989-1991 Chevrolet V3500, 1977-1978 GMC K35, 1979-1986 GMC K3500, and 1987-1991 GMC V3500. Check the Buyer's Guide tab to confirm.
Is this a front or rear shock?
This is a rear-position suspension shock absorber for the listed trucks and vans.
Should I replace shocks in pairs?
It's recommended. Shocks are sold individually, but replacing both sides on the same axle together supports balanced, even ride control.
What are signs my shock may need replacing?
Common signs include excessive bounce over bumps, a rough or unstable ride, uneven tire wear, or fluid leaking from the shock body. Diagnose the cause before replacing.
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