Keep every heavy-duty mile controlled with the Monroe Magnum Front Suspension Shock Absorber 65503, a gas-charged, large-bore shock built for the demands of class 6-8 trucks and buses. It installs up front on the 1989-2019 Blue Bird All American FE, the 1989-2020 Blue Bird All American RE, and the 1999-2023 Freightliner MT55 — see the Buyer's Guide tab to confirm your unit. Monroe describes the Magnum as the first gas-charged, large-bore shock for air spring and taper leaf suspensions, using a nitrogen gas charge for the fast response heavy-duty suspensions demand.
- Consistent ride: All-weather fluid with special additives helps handle extreme temperatures and reduce oil breakdown, and a larger 2-3/8-in. reserve tube holds more fluid (most applications).
- Exceptional handling: 10-Stage valving tuned to each vehicle, with a larger 1-3/4-in. bore for more efficient damping control and a smooth ride (most applications).
- Strong and durable: Shouldered bushing and bonded bushing with sleeve protect against bushing walkout, with arc welds up to 360° for durability.
- Longer service life: A PTFE-coated bearing reduces friction between rod and rod guide, and a nitrocarburized piston rod adds durability (most applications).
The nitrogen gas-charge helps maintain tire-to-road contact by reducing aeration and shock fade for improved ride and handling. Backed by Monroe's 90-day Risk Free Ride Offer and Limited Commercial Warranty.
Frequently Asked Questions
What does the Monroe Magnum 65503 do?
It is a front, gas-charged, large-bore hydraulic shock absorber that dampens suspension movement to help control ride motion and maintain tire-to-road contact on class 6-8 trucks and buses.
Which vehicles does it fit?
It fits the front position on the 1989-2019 Blue Bird All American FE, 1989-2020 Blue Bird All American RE, and 1999-2023 Freightliner MT55. Check the Buyer's Guide tab to confirm your vehicle.
Is this shock designed for air spring suspensions?
Monroe describes the Magnum as a gas-charged, large-bore shock for air spring and taper leaf suspensions, using a nitrogen gas charge for fast response in heavy-duty systems.
What are signs this shock may need replacing?
Common signs include excessive bouncing, poor ride control, uneven or accelerated tire wear, and fluid leakage. Diagnose the cause before replacing, since other components can produce similar symptoms.
Should I replace shocks in pairs?
Replacing shocks as a matched pair across an axle is recommended for balanced, even ride control, though this listing is for one shock. Follow the vehicle's service procedure.
Write a Review