Rear Shock Absorber for 1999-2020 Freightliner MT55 & More - Monroe 66403

$63.99

Monroe Shocks & Struts Suspension Shock Absorber 66403

Part number: 66403

UPC: 048598075796

Condition: New

Weight: 5.80 LBS

Item Package Quantity: 1

$63.99

Current Stock: 20

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Monroe Shocks & Struts Suspension Shock Absorber P/N:66403

$63.99

Description

Keep hardworking commercial trucks riding under control with the Monroe Magnum Shock Absorber 66403. This gas-charged Magnum unit is built for class 3-6 vehicles and drops in as a rear-position replacement for the 2001-2011 Freightliner Century Class and the 1999-2020 Freightliner MT55. It helps reduce excessive vibration on high-mileage, severe-use trucks and buses when worn-out shocks are the cause. See the "Vehicles it fits" section for engine-level details.

Nitrogen gas-charge: maintains tire-to-road contact by reducing aeration and shock fade for improved ride and handling.
10-Stage valving: tuned to each vehicle, with a larger 1-3/8-in. bore that provides more efficient damping control on most applications.
All-weather fluid: contains special additives to help with extreme temperatures and reduce oil breakdown, while a 2-in. or 2-1/4-in. reserve tube holds more fluid.
Durable build: shouldered and bonded bushing with sleeve protects from bushing walkout, plus arc welds up to 360° and a PTFE-coated bearing to reduce rod friction.

Sold individually; replacing both rear units as a matched pair is recommended for balanced ride control. Backed by Monroe's 90-day Risk Free Ride Offer and Limited Commercial Warranty.

Interchange: HD12140607 · 1614794000 · 1615436000 · 1615592000 · 1616542000 · 1616836000 · 1620511000 · 1620541000 · 83154 · 9161041 · M83154 · 317529

Manufacturer's description

Product specs

Vehicles it fits

Interchange numbers

This part cross-references / interchanges with the following part numbers:

HD12140607, 1614794000, 1615436000, 1615592000, 1616542000, 1616836000, 1620511000, 1620541000, 83154, 9161041, M83154, 66403, 317529

Buyer's Q&A

Frequently Asked Questions

What vehicles does the Monroe 66403 fit?

It is a rear-position shock for the 2001-2011 Freightliner Century Class and the 1999-2020 Freightliner MT55. Check the "Vehicles it fits" section to confirm fitment for your truck.

Is this a front or rear shock absorber?

The 66403 is cataloged as a rear suspension shock absorber for the listed applications.

Is the shock gas-charged?

Yes. The Magnum 66403 uses a nitrogen gas-charge that helps maintain tire-to-road contact by reducing aeration and shock fade for improved ride and handling.

Do I need to replace both rear shocks together?

This listing is for one shock, sold individually. Replacing both rear units as a matched pair is recommended for balanced, even ride control.

What are signs my shock may need replacing?

Excessive vibration, poor ride control, and reduced handling on high-mileage or severe-use trucks may signal worn shocks. Diagnose the cause before replacing.