Monroe Shocks & Struts Suspension Shock Absorber P/N:66618
$60.99
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Keep your class 3-6 truck or bus settled over rough, high-mileage roads with the Monroe Magnum Rear Suspension Shock Absorber 66618. This gas-charged rear shock is built to handle the demands of high-mileage and severe-use commercial vehicles, and it drops in as a direct-fit replacement for the listed applications — including the 2016-2023 Chevrolet LCF 3500, 1992-2009 GMC W4500 Forward, 1988-2009 GMC W5500 Forward, 1986-2020 Isuzu NPR, and 2005-2025 Isuzu NRR. See the Buyer's Guide tab for the full list of 19 applications.
Gas-charged damping: A nitrogen gas-charge helps maintain tire-to-road contact by reducing aeration and shock fade for quicker, more consistent response.
All-weather fluid: Special additives help handle extreme temperatures and reduce oil breakdown, while a 2-in. or 2-1/4-in. reserve tube holds more fluid.
10-stage valving: Tuned to each vehicle, with a larger 1-3/8-in. bore for more efficient damping control on most applications.
Built to last: A shouldered and bonded bushing with sleeve helps protect against bushing walkout, with arc welds up to 360°, plus a PTFE-coated bearing and nitrocarburized piston rod for longer service life on most applications.
A robust hydraulic lock-out helps prevent over-extension on most applications, and the design helps isolate impact-related noise, vibration and harshness. Backed by Monroe's 90-day Risk-Free Ride Offer and Limited Commercial Warranty.
Frequently Asked Questions
Is this a front or rear shock absorber?
It's a rear suspension shock absorber for the listed applications. Check the Buyer's Guide tab to confirm it matches your vehicle.
What vehicles does the Monroe Magnum 66618 fit?
It's a direct-fit replacement for 19 applications, including Chevrolet LCF, GMC W4500/W5500 Forward, and Isuzu NPR, NQR and NRR models. See the Buyer's Guide tab for the full list.
Is this shock gas-charged?
Yes. It uses a nitrogen gas-charge that helps maintain tire-to-road contact by reducing aeration and shock fade for more consistent response.
What are signs my shock absorber may need replacing?
Excessive bouncing, extra vibration, reduced ride control, or fluid leaking from the shock body can be signs a worn unit may need replacing. Diagnose the cause before replacing.
Should I replace both rear shocks at once?
It's best practice to replace shocks on the same axle together as a matched pair for balanced, even ride control. This listing covers one shock absorber.
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Monroe Shocks & Struts Suspension Shock Absorber P/N:66618
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WARNING:
These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to
www.P65Warnings.ca.gov.
