Keep your Peterbilt's rear suspension planted mile after mile with the Monroe Gas-Magnum 65 Shock Absorber (MPN 65448). This rear-position shock drops in as a direct-fit replacement across a wide range of Peterbilt heavy-duty trucks, including the 1986-2008 357, 1981-1983 362, 1989-1995 and 1997 372, 1987-1996 375, 1988-1992 376, 1990-2001 377, 1990-2007 378, 1990-2007 379, 2008-2016 384, 1996-2007 385, 2006-2016 386, and 2011-2015 587.
- Rear position: cataloged for the rear suspension location.
- Ride-motion control: dampens spring and suspension oscillation to help keep the tires in contact with the road and limit unwanted body movement.
- Sold individually: for balanced, even ride control, replace the shocks on an axle as a matched pair.
Worn shocks often show up as excessive bouncing after bumps, a floaty or unsettled ride, added nose-dive under braking, or uneven/cupped tire wear — signs the rear shocks may need replacing. If a worn rear shock is the cause, this Gas-Magnum unit is designed to replace it. Always diagnose the underlying cause before replacing.
Interchange: 50719 · 12B51 · 63678 · 3166657 · 665753 · 85314 · 85700 · 87003 · 89425 · K37428 · K37428PLUS · 700422MT · 74400 · 1251G · 1251GS · 12B51G · 12B51GS · 12G51 · 12J59 · 12L570 · AMS700424 · 57374424 · 0301635 · 0304176 · 3919975. Manufacturer part number 65448.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What position does this shock fit?
It is cataloged for the rear suspension position on the listed Peterbilt applications.
Which vehicles does the Monroe 65448 fit?
It's a direct-fit rear shock for a range of Peterbilt trucks, including the 357, 362, 372, 375, 376, 377, 378, 379, 384, 385, 386, and 587. See the Buyer's Guide tab for the full year breakdown.
Is this sold as a pair?
It is sold individually. For balanced ride control, it's best to replace the shocks on an axle together as a matched pair.
How do I know if my rear shocks are worn?
Common signs include excessive bouncing after bumps, a floaty or unsettled ride, more nose-dive under braking, and uneven or cupped tire wear. Diagnose the cause before replacing.
What does this shock absorber do?
It dampens spring and suspension oscillation to help keep the tires in contact with the road and control body movement over uneven surfaces.
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