Smooth out the ride and keep a hardworking commercial truck planted with the Monroe Magnum Front Suspension Shock Absorber 66637. This gas-charged front shock is a direct-fit replacement for the 1976-1989 Chevrolet C50, 1980-1989 Chevrolet C60, and 1979-1989 Chevrolet C70 — see the "Vehicles it fits" section for engine-level details. Built for class 3-6 trucks and buses facing high mileage and severe use, it's designed to help reduce excessive vibration and deliver a stable, more comfortable ride when a worn unit is the cause.
- Gas-charged design: a nitrogen gas-charge is designed to maintain tire-to-road contact by reducing aeration and shock fade for improved ride and handling.
- All-weather fluid: special additives assist with extreme temperatures and help reduce oil breakdown, while a 2-in. or 2-1/4-in. reserve tube holds more fluid (when required).
- Tuned damping: 10-Stage valving tuned to the vehicle adjusts to road extremes, with a larger 1-3/8-in. bore for more efficient damping control (most applications).
- Durable build: a shouldered bushing and bonded bushing with sleeve protect against bushing walkout, plus arc welds up to 360° and a nitrocarburized piston rod for longer service life (most applications).
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
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
55074, A83304, E83304, 59079, 727631, 747931, 83304, SA66637, AMS600105, AMS660105, 600105, 600105MT, 660105MT, M83304, 34912, 601105, 661105, 6912, CAT912, CAX912, 66637, 57306911, 57306912, 57366637, L59079, 66912, 69912, 410048, 3919919
Frequently Asked Questions
What is the Monroe Magnum 66637?
It's a gas-charged front suspension shock absorber from Monroe's Magnum line, designed for class 3-6 commercial trucks and buses to help control vibration and provide a stable, comfortable ride.
Which vehicles does it fit?
It's a direct-fit front replacement for the 1976-1989 Chevrolet C50, 1980-1989 Chevrolet C60, and 1979-1989 Chevrolet C70. Check the "Vehicles it fits" section to confirm the fit for your truck.
Is this a front or rear shock?
This is a front suspension shock absorber, per the manufacturer's designation for the listed applications.
Why is it gas-charged?
The nitrogen gas-charge is designed to reduce aeration and shock fade, helping the shock maintain tire-to-road contact for improved ride and handling.
Should I replace shocks in pairs?
Shocks are commonly replaced as an axle pair so both sides wear and perform evenly. This listing is for one shock; order the quantity your vehicle requires.
