Keep body motion in check and control a hardworking rig with the Monroe Shocks & Struts Magnum 66458 front suspension shock absorber — a Freightliner Cascadia shock absorber engineered for the demands of high-mileage, severe-use class 3–6 trucks and buses. It installs in the front position and is a direct-fit replacement for the 2018-2024 Freightliner Cascadia. Gas-charged for quicker response, it helps damp excessive vibration when worn-out units are the cause.
- 10-stage valving: tuned to the vehicle to adjust to road extremes, while the larger 1-3/8-in. bore provides more efficient damping control on most applications.
- All-weather fluid: special additives assist with extreme temperatures and help reduce oil breakdown; a 2-in. or 2-1/4-in. reserve tube holds more fluid.
- Strong and durable: shouldered bushing and bonded bushing with sleeve protect from bushing walkout, with arc welds up to 360°.
- Nitrogen gas-charge: helps maintain tire-to-road contact by reducing aeration and shock fade.
A bearing with PTFE coating reduces friction between the rod and rod guide, and a nitrocarburized piston rod supports longer service life on most applications. Backed by Monroe's 90-day Risk Free Ride Offer and Limited Commercial Warranty.
Interchange: HD12140845 · 98031020 · AMS66458 · 1014193000 · 1014282000 · 1014317000 · A90193 · X900700973 · 83396 · 89396 · 5107857
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What vehicle does the Monroe Magnum 66458 shock absorber fit?
It is a direct-fit front shock absorber for the 2018-2024 Freightliner Cascadia. See the Buyer's Guide tab to confirm the fit for your specific truck.
Is this a front or rear Cascadia shock absorber?
The catalog lists the 66458 as a front suspension shock absorber. It installs in the front position on the listed application.
What are signs my shock absorber may need replacing?
Excessive vibration, reduced ride comfort, and a shock that no longer controls body motion may signal a worn unit. Diagnose the cause before replacing, as other suspension parts can produce similar symptoms.
Is the Magnum 66458 gas-charged?
Yes. It is nitrogen gas-charged, which helps maintain tire-to-road contact by reducing aeration and shock fade for more consistent damping.
What kind of vehicles is this Magnum shock designed for?
It is designed to handle the demands of high-mileage and severe-use class 3–6 commercial trucks and buses, such as the Freightliner Cascadia.
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