Smooth out the ride in your hardworking Chevy medium-duty truck with the Monroe Magnum Front Suspension Shock Absorber 66637. This gas-charged front shock drops in as a direct-fit replacement for the 1976-1989 Chevrolet C50, 1980-1989 Chevrolet C60, and 1979-1989 Chevrolet C70 — see the Buyer's Guide tab for engine-level fitment.
- Built for commercial duty: designed to handle the demands of high-mileage, severe-use class 3-6 trucks and buses.
- Gas-charged control: a nitrogen gas charge helps maintain tire-to-road contact by reducing aeration and shock fade for improved ride and handling.
- Consistent ride: 10-stage valving tuned to the vehicle and a larger 1-3/8 in. bore provide efficient damping control on most applications.
- Strong and durable: shouldered and bonded bushing with sleeve help protect against bushing walkout, with arc welds up to 360°, a PTFE-coated bearing, and a nitrocarburized piston rod for longer service life on most applications.
All-weather fluid with special additives assists in extreme temperatures and helps reduce oil breakdown, while a 2-in. or 2-1/4-in. reserve tube holds more fluid when required. A robust hydraulic lock-out helps prevent over-extension on most applications. If worn shocks are behind excessive vibration, bouncing, or poor control, these Magnum units replace them. Backed by Monroe's 90-day Risk Free Ride Offer and Limited Commercial Warranty.
Interchange: 55074 · A83304 · E83304 · 59079 · 727631 · 747931 · 83304 · SA66637 · 600105 · 600105MT · 660105MT · M83304 · 34912 · 601105 · 661105 · 6912 · CAT912 · CAX912 · AMS600105 · AMS660105 · 57306911 · 57306912 · 57366637 · L59079 · 66912 · 69912 · 410048 · 3919919
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
Does this shock fit my truck?
It is a direct-fit front shock for the 1976-1989 Chevrolet C50, 1980-1989 Chevrolet C60, and 1979-1989 Chevrolet C70. Check the Buyer's Guide tab to confirm engine-level fitment for your vehicle.
Is the Monroe Magnum 66637 gas-charged?
Yes. It uses a nitrogen gas charge that helps maintain tire-to-road contact by reducing aeration and shock fade for improved ride and handling.
What position does this shock mount in?
It is a front suspension shock absorber for the listed Chevrolet medium-duty applications.
How do I know my shocks need replacing?
Excessive vibration, bouncing, extended stopping, or poor ride control can be signs of worn shocks. Diagnose the cause first; if the front shocks are worn, these Magnum units replace them.
Is this shock built for commercial use?
Yes. The Magnum line is designed to handle the demands of high-mileage, severe-use class 3-6 trucks and buses, and comes with Monroe's Limited Commercial Warranty.
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