Keep your hardworking class 3-6 truck or bus riding controlled with the Monroe Magnum Front Suspension Shock Absorber 66613. This gas-charged front shock is built for the demands of high-mileage, severe-use commercial vehicles and drops in as a front-position replacement for applications including the 1999-2004 Freightliner FC70, 1999-2007 FC80, 1995-2005 FL50, 1991-2005 FL60, 1991-2006 FL70 and FL80, 1992-1995 MB60 and MB70, 2003-2010 Sterling Truck Acterra, 2001-2007 Acterra 5500/6500/7500, 2001-2003 Acterra 8500, and 1999-2007 SC8000 Cargo. See the Buyer's Guide tab for the full list.
- Nitrogen gas-charged: helps maintain 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 for more efficient damping control on most applications.
- All-weather fluid: 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.
- Strong and durable: shouldered and bonded bushing with sleeve protects from bushing walkout, arc welds up to 360°, and a PTFE-coated bearing with nitrocarburized piston rod support longer service life on most applications.
A robust hydraulic lock-out helps prevent over-extension of air bags, piston top-out, and damage to the seal assembly on most applications, while isolating impact-related noise, vibration, and harshness. Excessive vibration or poor ride control on high-mileage units are signs the original shock may need replacing; diagnose the cause before replacing. Backed by Monroe's 90-day Risk Free Ride Offer and Limited Commercial Warranty.
Interchange: A83123 · HD12140566 · M89405 · F347244 · 1614577000 · 1616082000 · 654654 · 6803230200 · 83123 · 9160092 · 36788006 · A22401 · 600173 · 600173MT · M83123 · 6613 · AMS600173 · 57306613 · 316831 · 3919573 · SA3123
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What vehicles does the Monroe Magnum 66613 fit?
It's a front shock for class 3-6 commercial trucks and buses, including the 1999-2004 Freightliner FC70, 1991-2006 FL70 and FL80, and 2003-2010 Sterling Truck Acterra. See the Buyer's Guide tab for the full list.
Is this a front or rear shock absorber?
Per the catalog, the 66613 is a front suspension shock absorber for the listed applications.
What does the nitrogen gas charge do?
The gas charge helps maintain tire-to-road contact by reducing aeration and shock fade, which supports improved ride and handling.
How do I know my shocks may need replacing?
Signs on high-mileage or severe-use vehicles include excessive vibration and reduced ride control. Diagnose the cause before replacing, since other suspension parts can produce similar symptoms.
Should I replace both front shocks at once?
It's best practice to replace both front shocks together as a matched pair for balanced ride control. This listing covers one shock absorber.
Write a Review