Monroe Magnum 70 Series Heavy Truck Shocks
Monroe Magnum 70 Series shocks target demanding medium- and heavy-duty suspension applications. Selecting one for a truck, tractor, trailer, or bus requires the correct equipment specification rather than a broad assumption that a heavy-truck shock fits any commercial chassis.
Control for working suspensions
A commercial vehicle’s shocks control spring and axle movement as road inputs and loads change. Effective damping helps the suspension settle instead of continuing to oscillate. The 70 Series is around firm control for demanding service, but the correct calibration and installation depend on the particular vehicle and suspension position.
Gas charge and large-bore design
The series combines gas charging with a large-bore design. These features support its heavy-duty damping role, but they are not substitutes for an application match. A larger body or heavy-duty label alone cannot tell you whether the shock has the right travel, mounting ends, or clearance for the equipment being repaired.
Use the OE number when available
Record the original equipment shock number, chassis identification, axle or suspension information, and installation position. Monroe’s heavy-duty catalog may require these details to distinguish otherwise similar parts. If a number is unreadable, document mounting dimensions and compressed and extended requirements using the catalog’s measurement method rather than estimating from an installed shock.
Check the surrounding suspension
Inspect brackets, bushings, fasteners, springs, and any air-suspension height-control equipment before installation. A shock cannot correct a broken mount or incorrect operating height. Compare cab, axle, trailer, and coach applications carefully because their duties differ. Follow commercial-vehicle service procedures and the specified tightening instructions for the exact replacement.
Photos and diagrams
Related reading
Frequently asked questions
Can I choose a Magnum 70 by truck make alone?
Often more detail is needed, including chassis, suspension position, technical dimensions, or the original equipment number.
Is a cab shock interchangeable with an axle shock?
Not by assumption. They serve different installations and must be selected through the correct application information.
