Monroe 66122 | Suspension Shock Absorber

Part Number
Magnum Cab Shock Absorber

Fits: 01-11 Freightliner Century Class, 01-18 Freightliner Columbia, 01-20 Freightliner Coronado, 03-16 Freightliner M2 112, 09-17 Freightliner Cascadia, 12-19 Freightliner 108SD, 12-18 Freightliner 114SD, 13-16 Freightliner 122SD

Special Price $44.19 Regular Price $51.99
In stock
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Estimated Ship Date: 1 Business Day or Less
The Monroe® Magnum™ Cab Shock isolates the cab from the frame, offering a smoother, more comfortable ride. Specifically designed for today's heavy-duty cab suspension, the gas-charged Monroe Magnum™ Cab Shock utilizes patented groove tube technology and velocity-sensitive valving to deliver a new industry standard in driver comfort, with reduced fatigue. (On most applications)

BRAND: Monroe Shocks & Struts


  • 2019-2012 Freightliner 108SD Cab, 2018-2012 Freightliner 114SD Cab, 2015-2014 Freightliner 122SD Cab, 2017-2009 Freightliner Cascadia Cab, 2011-2001 Freightliner Century Cab, 2011-2001 Freightliner Century Class Cab
  • Monroe Shocks & Struts Magnum Cab 66122 Shock Absorber
  • Magnum Cab Shock Absorber
  • 1-3/8-inch (35 mm) bore: Larger bore than most shocks to provide more efficient and consistent control - on most applications
  • Loop welding technique: Resistance weld with additional 360-degree weld provide up to 12,100 lbs. (5,488 kg) tensile strength for maximum durability - when required
  • Tenneco shouldered bushings: Shouldered bushing and bonded bushing with sleeve designs prevent (bushing walkout) for improved quality and durability - on most applications
  • Magnum Cab Shock Absorber
  • .05-inch pressure tube withstanding pressure of 9KPSI - On most applications
  • 2-inch (50.8 mm) reserve tube: More fluid for more consistent performance - on most applications
  • Nitrogen gas-charged: For improved ride and handling, helps maintain tire to road contact by reducing aeration
  • 10-stage valving: Reacts to wide range of driving conditions - on most applications
  • PTFE coated bearing: Reduces friction during operation between the rod and rod guide, improving durability - on most applications
  • Robust hydraulic lock-out: Prevents over-extension of the suspension, top-out of the piston and averts damage to the seal assembly - on most applications


Compressed Bumper StopNo
Compressed Length8.3300
Dust ShieldYes
Dust Shield IncludedYes
Dust Shield MaterialMetal
Extended Bumper StopNo
Extended Hydraulic LockoutNo
Extended Length10.3300
Lower Mounting CodeL1
Lower Mounting DescriptionLoop Bushing Mount - 5/8" Bushing ID X 1.5/16" Bushing OAL
Parts PackNone
Travel Length2.0000
Upper Mounting CodeLS84
Upper Mounting DescriptionLoop Bushing & Sleeve Mount - 12MM Sleeve ID X 60.33MM Sleeve OAL



  • Freightliner: 1832999001
  • Gabriel: 654990
  • Gabriel: 83040
  • OEM: 1841762002
  • Gabriel: 659178
  • OEM: 1832999001
  • OEM: 1869674000
  • Meritor: M83038
  • FOX Commercial Truck Shocks: 98030001
  • Gabriel: 83038
  • Sachs: 814903003528
  • OEM: 1860764000
  • Freightliner: 1841762002
  • OEM: 1841762000
  • OEM: 1860765002
  • Sachs: 315616


  • 2009-2017 Freightliner Cascadia - Position: Cab
  • 2013-2016 Freightliner 122SD - Position: Cab
  • 2012-2019 Freightliner 108SD - Position: Cab
  • 2003-2016 Freightliner M2 112 - Position: Cab
  • 2001-2018 Freightliner Columbia - Position: Cab
  • 2012-2018 Freightliner 114SD - Position: Cab
  • 2001-2020 Freightliner Coronado - Position: Cab
  • 2001-2011 Freightliner Century Class - Position: Cab
Customer Questions
How often should shock absorbers be replaced?
Shock absorbers should generally be replaced every 50,000 miles or every 5-7 years
How to replace shock absorbers?
To replace shock absorbers, you need to remove the wheel and tire assembly, unbolt the old shock absorber, replace it with a new one, and tighten the bolts. Then, reinstall the wheel and tire, and test the new shocks.
Why do shock absorbers leak?
Shock absorbers can leak due to worn seals, damage to the piston or cylinder, or corrosion from exposure to moisture and road salt.
Can shock absorbers be replaced?
Yes, shock absorbers can be replaced when they start to wear out or fail.
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