Keep hardworking suspension under control with the Monroe Magnum Severe Service Suspension Shock Absorber 550012, a gas-charged, heavy-duty front shock built for demanding first-responder, municipal, fleet and jobsite duty. It installs as a direct-fit front replacement for the 1971-1996 Chevrolet Caprice and 1971-1985 Chevrolet Impala — see the Buyer's Guide tab for engine-level fitment.
- Built for severe service: 10-stage valving adjusts to road extremes to help handle frequent stops, heavy loads and high miles.
- Nitrogen gas-charged: maintains tire-to-road contact for improved ride and handling by reducing aeration and shock fade.
- Strong and durable: double welded with arc welds up to 360 degrees, plus a shouldered bushing and bonded bushing on most applications.
- Built to last: heavy-duty nitrocarburized rod on most applications and a sintered iron piston enhance durability; a larger bore, bigger 2-in. reserve tube and 0.05-in. pressure tube hold more oil for controlled ride.
- Smooth operation: OE all-weather fluid handles extreme temperatures while a PTFE-banded piston helps reduce friction against the pressure tube.
Sold individually; replacing both front shocks together as a matched pair is recommended for balanced ride control.
Interchange: 77375 · 344081 · KG5458 · 12140182
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What is the Monroe 550012 and what does it do?
It's a gas-charged, heavy-duty front Magnum Severe Service shock absorber that dampens spring and suspension movement to help control ride and maintain tire-to-road contact.
Which vehicles does the 550012 fit?
It's a front-position direct-fit for the 1971-1996 Chevrolet Caprice and 1971-1985 Chevrolet Impala. Check the Buyer's Guide tab for engine-level fitment for your vehicle.
What makes the Magnum Severe Service shock heavy-duty?
It uses 10-stage valving, a nitrogen gas charge, double-welded construction with arc welds up to 360 degrees, and a larger bore with a 2-in. reserve tube to hold more oil.
Do I need to replace both front shocks?
This listing is for one shock, sold individually. Replacing both front shocks together as a matched pair is recommended for balanced, even ride control.
What interchange numbers does the 550012 replace?
It cross-references 77375, 344081, KG5458, and 12140182. Match your original part number to confirm the correct replacement.
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